Rocket voice actor Bradley Cooper kept things casual in a sweater and sneakers.
Chukwudi Iwuji plays the bad guy, the High Evolutionary, in the sequel — and he wore a sharp green suit for the premiere.
Will Poulter looked equally suave in a Yves Saint Laurent suit.
Kraglin star Sean Gunn also brought his wife, actor Natasha Halevi, to the premiere.
Brothers Sean and James Gunn also snapped a photo together.
Marvel newcomer Daniela Melchior also showed up in a vibrant pair of green boots.
Australian star Elizabeth Debicki reprises her role as High Priestess Ayesha in "Vol. 3," and she brought an ethereal look to the carpet.
"Guardians of the Galaxy" alumni Michael Rooker showed up to support his friends and rocked a casual flowery shirt.
Marvel fans might know Linda Cardellini as Linda Barton in "Avengers" and "Hawkeye," but she voices Lylla the Otter in "Guardians of the Galaxy Vol. 3," and she brought her daughter to the premiere.
Actor Rob Lowe also attended the premiere with his son, Matthew Edward Lowe.
The whole cast later took to the stage to introduce the film.
TikTok star Paul Arnott is involved in the hunt for missing Jay Slater in Tenerife – but when interviewed by This Morning, he revealed his thoughts on Jay's chances of survival
Victoria Beckham looked incredible on Instagram wearing a gold, see-through dress to advertise her perfume, Portofino 97 - from her Victoria Beckham Beauty brand.
Jude Bellingham scored a stunning overhead kick in the fifth minute of stoppage time in England vs Slovakia - and Man United icon Roy Keane showed a trademark reaction to the goal
Roy Keane has been a prominent figure in the ITV studio throughout Euro 2024 and he was at it again with a hilarious quip in the build-up to England's last 16 clash
King Charles is said to be in discussions to visit his estranged son Prince Harry in America for the first time in years - but his wife and Prince William are reportedly not happy
Lady Kitty Spencer has finally revealed the unique name she's chosen for her baby daughter in a sweet new post on Instagram, as royal fans gush over the 'beautiful' moniker
Kirk Bradley and Tony Downes were 'thick as thieves' - that all ended when an armed Manchester gang busted them out of a prison van on the way to court
Right now, the US Navy only operates big, nuclear-powered submarines that can travel thousands of miles at high speeds across the Pacific and Atlantic Oceans and linger for months in conflict zones. But nuclear subs are complex, expensive and maintenance-intensive.