The trio were joined by Jamie Campbell Bower, who plays Caius, and MyAnna Buring, who plays Tanya Denali.
R-Patz said it was good to be back on home turf: "It's just nice to be back in London. I'm hardly ever here anymore so it's really nice."
Taylor Lautner smiles for the cameras at the UK premiere of the latest Twilight movie, Breaking Dawn - Part 1, in London on Wednesday evening.
Some Twilight fans had camped out for days to see their stars. This one came all the way from Hungary in eastern Europe!
The fourth film in the series sees Robert Pattinson and Kristen Stewart's characters Edward and Bella finally tie the knot.
Taylor said there's a lot going on in this movie: "Everything that's been bottled up in the past three movies kind of explodes in this one."
Pixie Lott on why she's a Twilight fan: "It covers all areas, like a teen movie, it's like romantic, but then there's a fight scene, there's like magical moments."
There were also stars from the sporting world there, including world tennis number one Novak Djokovic - seen here with his girlfriend.
Not one to miss out, X Factor judge Tulisa brought along her girls Little Mix!
Kristen Stewart's appearance was a last-minute surprise. She said of all the fans that turned up: "It's funny because it's happened before, but you never expect it to continue on this level."
Joining the Twilight stars on the red carpet were X Factor girls Janet Devlin, Misha B and Amelia Lily.
