Miley Cyrus shares the big-screen with her boyfriend Liam Hemsworth in Disney's 'The Last Song.' The young lovebirds chirped about kissing in front of Miley's mom, Tish, who was the film's executive producer.

Liam told ET's Kevin Frazier, "Her mom was watching. Her grandma was also watching, which was really funny. She was on set everyday and she'd be right at the monitor with the headphones on…She should have been directing the film. She knew more about it than anyone." He also admitted, "Intimacy's always tough. I feel like it's the hardest thing for me as an actor."

Miley blushed: "I don't know who had a bigger crush on him at the beginning, my mom or me. I was like, 'No, maybe he's just too pretty. I don't want to be with someone who's better looking than me. That's like awkward.'"

In theaters March 31 and adapted from best-selling author Nicholas Sparks' latest novel of the same name, 'The Last Song' finds Miley playing a rebellious teen sent to spend her summer with her estranged father (Greg Kinnear).

We also sat down with co-stars Greg and Kelly Preston. Watch the video for more!