New Crystal Palace manager Ian Holloway watched from the stands as his new club climbed to third in the Championship table.
Glenn Murray scored either side of half-time to condemn new Blackburn boss Henning Berg to defeat and extend Palace's unbeaten run to 11 matches.
Palace striker Murray headed in Owen Garvan's cross late in the first half, before scoring a 60th-minute penalty.
The defeat leaves Blackburn sixth in the table.
And they have now won only one of their past seven away matches in the league.
While Holloway, who was confirmed as Dougie Freedman's replacement on Saturday, will have been impressed by what he saw, Berg, who himself only took charge on Wednesday, will have been left in no doubt as to the magnitude of the task he faces.
Championship managers on debut
Dougie Freedman's Bolton overcame leaders Cardiff 2-1
Sean Dyche's Burnley beat Wolves 2-0
Mick McCarthy's Ipswich beat Birmingham 1-0
Henning Berg's Blackburn lost 2-0 at Crystal Palace, who had new boss Ian Holloway watching in the stands
The prospect of playing an in-form Palace outfit, whose last defeat came in August, was daunting enough for Rovers, but the hosts had an extra incentive with the watching Holloway assessing his new side.
It was, however, Blackburn who almost broke the deadlock first. An outswinging corner from Morten Gamst Pedersen was met by Dickson Etuhu but his header crashed back off the crossbar.
Palace recovered well, with a post denying Yannick Bolasie his first Eagles goal, and the hosts finally broke the deadlock in first-half stoppage time.
Garvan's cross from the right found an unmarked Murray in the six-yard box and he guided his header into the net via the underside of the crossbar.
Holloway was given a rousing reception as he introduced himself to the home support on the pitch at half-time and Palace continue to dominate after the break.
Wilfried Zaha was at the heart of everything but it was Murray who drew Grant Hanley into committing a foul inside the box which referee Lee Probert saw as a clear penalty.
Murray stroked the ball beyond Blackburn goalkeeper Paul Robinson and the striker could have completed a second hat-trick of the season six minutes later, again from the penalty spot, when Adam Henley fouled Bolasie, but Robinson saved the spot-kick.
Blackburn substitute Ruben Rochina was twice denied by the woodwork as Palace rode their luck in registering their first clean sheet at home this term.
Crystal Palace caretaker manager Curtis Fleming: "The players were fantastic. I think they should be playing with confidence but we should concentrate on what we do and not get carried away. Everyone has to work hard.
"Ian Holloway came in before the match. We have a video presentation at 1.15 at home games so he came down just before that to introduce himself.
"He was lively, as he is, and I think the lads quite enjoyed it and they will quite enjoy working with him."
Blackburn manager Henning Berg: "It was neither the performance nor the result we would have liked.
"We had a bad performance and I think we can be much better than this. It is a fresh start. I don't know everybody 100 per cent yet.
"It's a good squad we have here but there is room for a lot of improvement and we will do that. "I have seen this team play much better than they did today so hopefully it is a one-off."
Live Text Commentary
Full Time The game is over, as the referee blows his whistle.90:00 +0:24 Substitution
Substitution Wilfried Zaha leaves the field to be replaced by Dean Moxey.89:29
Yannick Bolasie decides to take the corner short.88:51
Simon Vukcevic challenges Wilfried Zaha unfairly and gives away a free kick. Owen Garvan takes the free kick.86:25
Free kick awarded for a foul by Ruben Rochina on Jonathan Parr. Damien Delaney takes the direct free kick.82:21
Wilfried Zaha challenges Martin Olsson unfairly and gives away a free kick. Grant Hanley takes the free kick.81:20
Ruben Rochina takes a shot.80:54
Short corner taken by Mauro Formica.79:55
Effort on goal by Glenn Murray from inside the area goes harmlessly over the bar.77:52
Free kick awarded for a foul by Grant Hanley on Glenn Murray. Free kick taken by Mile Jedinak.75:32
Unfair challenge on Simon Vukcevic by Wilfried Zaha results in a free kick. Paul Robinson restarts play with the free kick.74:55
Effort from the edge of the penalty area by Simon Vukcevic goes wide of the left-hand post.71:09 Substitution
Substitution Markus Olsson goes off and Simon Vukcevic comes on.71:07
Headed effort from deep inside the penalty area by Mauro Formica misses to the right of the target.70:36
Glenn Murray takes a shot. Save made by Paul Robinson.70:36 Penalty
Penalty taken by Glenn Murray saved by Paul Robinson. Crystal Palace 2-0 Blackburn.69:49
Yannick Bolasie fouled by Adam Henley, the ref awards a Penalty.66:35
Unfair challenge on Markus Olsson by Wilfried Zaha results in a free kick. Free kick taken by Paul Robinson.65:24
Corner taken left-footed by Ruben Rochina.64:41 Goal scored
Goal! - Glenn Murray - C Palace 2 - 0 Blackburn Glenn Murray scores a placed penalty. Crystal Palace 2-0 Blackburn.
Glenn Murray fouled by Grant Hanley, the ref awards a Penalty.61:53
Owen Garvan challenges Paul Robinson unfairly and gives away a free kick. Paul Robinson restarts play with the free kick.59:49
Markus Olsson challenges Wilfried Zaha unfairly and gives away a free kick. Direct free kick taken by Julian Speroni.58:10 Substitution
Substitution (Blackburn) makes a substitution, with Mauro Formica coming on for Morten Gamst Pedersen.56:53
Martin Olsson concedes a free kick for a foul on Yannick Bolasie. Owen Garvan takes the direct free kick.56:17
Shot by Morten Gamst Pedersen. Save by Julian Speroni.54:27
Wilfried Zaha takes a shot. Scott Dann gets a block in. Yannick Bolasie takes a shot. Save made by Paul Robinson.52:33 Substitution
Substitution Ruben Rochina replaces Colin Kazim-Richards.51:47
Yannick Bolasie takes a shot from just outside the penalty area which clears the crossbar.48:41
Corner taken short by Owen Garvan.48:00
Shot from 30 yards from Morten Gamst Pedersen. Mile Jedinak gets a block in. Kagisho Dikgacoi has a drilled shot. Grant Hanley gets a block in.47:27
Morten Gamst Pedersen fouled by Wilfried Zaha, the ref awards a free kick. Adam Henley takes the direct free kick.45:01
The referee gets the second half started.45:00 +1:28 Half time
Half Time The first half comes to an end.45:00 +0:17
Assist on the goal came from Owen Garvan.45:00 +0:17 Goal scored
Goal! - Glenn Murray - C Palace 1 - 0 Blackburn Glenn Murray finds the back of the net with a headed goal from inside the six-yard box. Crystal Palace 1-0 Blackburn.42:43
Owen Garvan takes a inswinging corner from the right by-line to the near post, Header on goal by Glenn Murray from inside the box goes harmlessly over the target.42:16
Danny Murphy concedes a free kick for a foul on Wilfried Zaha. Owen Garvan takes the free kick.40:32
Header from inside the area by Yannick Bolasie bounces off the post.39:36
Free kick awarded for an unfair challenge on Wilfried Zaha by Morten Gamst Pedersen. Free kick taken by Mile Jedinak.38:53
Morten Gamst Pedersen concedes a free kick for a foul on Mile Jedinak. Free kick taken by Jonathan Parr.38:20
Mile Jedinak takes a shot from deep inside the box clearing the bar.35:08
Unfair challenge on Markus Olsson by Joel Ward results in a free kick. Dickson Etuhu restarts play with the free kick.31:48
Yannick Bolasie takes a shot. Save by Paul Robinson.31:29
Close range shot by Owen Garvan clears the bar.28:53
Foul by Morten Gamst Pedersen on Wilfried Zaha, free kick awarded. Mile Jedinak restarts play with the free kick.28:11
Yannick Bolasie gives away a free kick for an unfair challenge on Martin Olsson. Direct free kick taken by Danny Murphy.27:13
Free kick awarded for a foul by Dickson Etuhu on Owen Garvan. Free kick taken by Mile Jedinak.24:50
Corner taken left-footed by Morten Gamst Pedersen from the left by-line to the near post, Dickson Etuhu takes a shot.22:53
Inswinging corner taken right-footed by Yannick Bolasie.22:06
Corner taken left-footed by Owen Garvan from the right by-line, Damien Delaney takes a shot. Save by Paul Robinson.19:51
Corner taken left-footed by Owen Garvan.12:11
Glenn Murray gives away a free kick for an unfair challenge on Grant Hanley. Free kick taken by Martin Olsson.7:06
Unfair challenge on Morten Gamst Pedersen by Kagisho Dikgacoi results in a free kick. Morten Gamst Pedersen takes the direct free kick.2:18
Shot from just outside the box by Yannick Bolasie misses to the right of the goal.0:00
The match has kicked off.
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