Dev gets reactions to his cameo appearance from the cast of Friday Download: Up All Night!
Lady Gaga, Biffy Clyro and Katy Perry - not a bad start to Headliners' Day on Radio 1!
Dev has your weekend breakfast covered.
Elizabeth Banks is Dev's special guest.
Dev sits in for Greg James with a Best Friend Test and an extended Ten-Minute Take-Over.
Dev kicks off the weekend, including a guide to Radio 1's interactive Big Weekend game.