Rachel Bilson would give Hayden Christensen 10 out of 10 for kissing.

The 26-year-old actress revealed her handsome co-star knew exactly what he was doing when they locked lips in love scenes for new sci-fi thriller 'Jumper.'

She said, "I'm sure all the ladies will be happy to know Hayden is a 10 when it comes to kissing."

Hayden returned the compliment, saying, "Rachel is top notch too, we kiss well."

Although Rachel enjoyed the kissing, she admits she still struggles when it comes to shooting sex scenes.

The former 'O.C.' star added to BANG Showbiz, "Sex scenes and love scenes are always uncomfortable just because it's so unnatural and it's usually forced.

"I was lucky enough to have someone as handsome as Hayden, but it's always a bit awkward."

Hayden - who plays a man who can teleport anywhere in the world in the movie - also revealed he finds sex sequences hard.

The 26-year-old actor added, "There are cameras around, and you are kissing someone for the first time - it's weird."

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