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27 June 2012, 18:26
The actor was left outside as the doors slammed shut after the celebrities left a spot in Los Angeles last night.
Twilight actor Robert Pattinson was left looking embarrassed after a mini bus containing Justin Bieber, Selena Gomez and Katy Perry almost left without him.
The Hollywood star was following the musicians into the vehicle after they all left a venue together when the door slammed shut with bodyguards blocking his entry.
Robert smiled and was asked by paparazzi photographers if he had "ever been stuck in a more awkward situation"
After a knock on the bus, the door eventually opens to let the actor inside.
The celebrities were all heading out to celebrate the premiere of Katy Perry's premiere for her new 3D movie which took place in Hollywood last night (26th June).
You can view a picture of Robert laughing after the door to the bus slams shut below:
The premiere saw Katy take to the stage before walking the pink carpet and she was sporting a candy bar and film strip outfit for the performance.
Other attendees at the event included Billboard Hot 100 number one star Carly Rae Jepsen.
Watch the moment Robert Pattinson is denied access to the bus with Justin Bieber, Selena Gomez and Katy Perry below:
Robert also recently revealed details on another awkward encounter with BRIT and Grammy Award winning star Adele after he ended up in an argument with the 'Someone Like You' star over her level of fame.