Britney Spears got 'contact high' from Las Vegas partygoers

Britney Spears once got a "contact high" from audience members at her Las Vegas show because the fumes from their drugs were so strong.

The 34-year-old singer has been performing in Sin City with her Britney: Piece Of Me residency show at Planet Hollywood, which began in December 2013 and is set to run until May 2017, and she admits her audience are often under the influence and it can sometimes affect her as well.

“A lot of the people are very intoxicated during the shows," she tells U.K. host Jonathan Ross. "I actually got contact high. I haven’t smoked weed since I was like 17 years old and all of a sudden, towards the end of the show, it was so strong I couldn’t function because I just got the contact of it. I was like ‘Oh my goodness!’ I had to leave, I had to go. I kinda just said, ‘I can’t do it anymore.’”

Britney is surrounded by parties in Vegas but she admits she's not at all tempted to go along because there are drugs involved and she would rather just go home and watch films.

“I’m kinda boring. I love movies," she confessed. "I know it sounds so boring but I’m not this crazy go out girl, that’s not me. I cook. I like a lot of different rices. I like rice, I do, that’s my favorite thing!”

She is known for wearing a variety of revealing outfits and performing sexually-charged routines onstage but Britney admits her stage persona is far removed from who she really is.

"I’m used to my show, it’s like a character change," she explained. "I’m a performer so I know how to mentally adjust my head to go there in character. It’s not me, it’s not who I am at all but it’s part of what I do."