Mandy Moore makes a sizzling guest appearance as a tattooed bad girl who woos the newly single Ted (Josh Radnor) on the season premiere of How I Met Your Mother tonight. But all was not comfortable on the set during filming — Josh tells OK! at the CBS fall season party that those make-out sessions the two had to share were more than awkward.

“It was very odd because we immediately had to be making out — I mean, immediately because we’re making out in about half the episode, so it was kind of like, ‘Hey, nice to meet you, so glad you’re doing this and…,’ ” Josh says, miming a lusty kiss. “And then there’s 80 people watching, so it’s actually not very romantic.”

Still, Mandy was game. Josh smiled, “She went for it! She’s a good ‘fake’ kisser.”

Someone else was game too — co-star and Emmy nominee Neil Patrick Harris, who plays the womanizing playboy Barney on the hit sitcom. The actor is openly gay in real life and jokes to OK!, “While they were kissing I kept trying to just poke my tongue in there. They kept stopping me.”

The second season of How I Met Your Mother premieres tonight at 8 p.m. on CBS. Keep an eye out for another musical guest star — Enrique Iglesias!

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