Miley Cyrus straddling and unknown male on set may be a reason why LiamHemsworth split with Miley, reports E! News. It appears to be costar Adam Sevani. The photographer told E!:

'It looked like she was looking at something that he was holding. I was at the set of the movie. I was out in my car and I could see in between the trailers and I saw them. I think it's Adam Sevani but it was hard to tell.'

Miley's rep hasn't commented, but a friend said she isn't seeing anyone else. Liam's US Open Surf Competition hookup will be revealed in Star. Are YOU upset that they are broken up?