Liam Hemsworth made his first public appearance since fiancee Miley Cyrus's racy MTV VMAs performance.

The Hunger Games actor supported his brother Chris Hemsworth at the world premiere of Rush in London on Tuesday night.

Liam appeared to be in good spirits as he walked the red carpet. Looking dapper in a suit, Liam avoided any questions about his fiancee and tried to keep his hands in his pockets.

Rumors have been swirling that Liam and Cyrus are on the rocks after The Last Song actress stripped alongside giant teddy bears and twerked on Robin Thicke at the VMAs last week.

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Liam was reportedly "mortified" by Cyrus' performance and is being pressured by his friends to distance himself from the singer after her stage act, according to Radar Online.

Sources said the on-stage number was embarrassing for the young actor, whose career is taking off in the U.S., and his friends are worried that Cyrus' actions will have a negative effect on his career.

"Liam really does care about Miley, but her racy new look and sort of ghetto attitude isn't exactly what he signed up for," one unnamed friend told the website. "'His entire team is urging him to part ways with her because she's nothing but negative for his reputation and career. Liam is a serious actor with a growing career, while Miley has just turned into a joke. "

The stars met three years ago on the set of their film The Last Song. They got engaged in the summer of 2012.

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Miley Cyrus, Liam Hemsworth