Actor Robert Pattinson says he sweated like a `crazy person` while filming an intimate scene with co-star Julianne Moore for "Maps to the Stars".

In an interview with Heat magazine, the 28-year-old actor confessed that the amount of sweat even alarmed Moore, reports contactmusic.com.

The `Twilight` star struggled to keep his cool on the set in Toronto, Canada, during a raunchy sex scene with Moore. He sweated so profusely that the 53-year-old actress became concerned for his health.

The actor said: `'That was kind of hilarious - it was the first time I'd met Julianne as well. It was so hot in Toronto and she's one of these people - she doesn't sweat at all! But I sweat like a f**king crazy person.

"And I was trying to literally catch drops of sweat to stop them hitting her back. Afterwards, she was like, 'Are you having a panic attack?' It was so embarrassing."