Miley Cyrus & Liam Hemsworth: Red (Carpet) Hot!

Miley Cyrus and Liam Hemsworth, The Last Song co-stars and SO much more, made their red carpet debut as a couple at the Hollywood premiere of their movie.

Dressed in Calvin Klein, Liam joked that life got a little tougher after Cyrus confessed to Ellen DeGeneres that she fell for him after he opened a door for her.

"After all that, there's so much pressure for me to be opening doors for everyone now," the Australian stud muffin told E! Online. "It's just too much pressure."

Liam Hemsworth is still adjusting to the attention from female fans, who have been chasing after him when he attends premieres and screenings, and so forth.

"That was my first experience of the craziness," he said. "It's flattering. Funny, too."

LAST SONG HOTNESS: Miley and Liam debut as a couple.

Next stop on The Last Song PR tour is Europe with premieres next month in London, Rome and Munich. Let's just hope Liam and Miley are still together by then.

"I lost him so, he's not being the best boyfriend right now," Cyrus, who also performed on American Idol this week, joked after getting separated from her man.

"The whole deal was we were going to be walking together," the 17-year-old added. "But then I lost him first thing because he started saying hello to everyone."

Yeesh. Better step it up, Liam.