Gerard Butler accidentally flashed guests at his sister's wedding

Gerard Butler accidentally flashed 400 people at his sister's wedding.

The 49-year-old actor donned a traditional Scottish kilt - which is typically worn without underwear - to his sister Lynn's wedding, and has said that after forgetting to keep his legs together when he sat down, he ended up accidentally flashing all 400 people who attended the ceremony.

Speaking during an appearance on 'Conan', the 300 star said: "We're born in kilts. They're the worst diapers ... I've not worn a kilt as much as you'd think. I wore a kilt at my brother's wedding and at my sister's wedding, and I loved it both times, but they were both disasters.

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Cast member Gerard Butler (L) greets co-star Thandie Newton, as co-star Idris Elba watches, at the premiere of the movie "RocknRolla" at the Cinerama Dome in Hollywood, California October 6, 2008. The movie opens in the U.S. on October 31. REUTERS/Mario Anzuoni (UNITED STATES)
CAPTION CORRECTION - SPELLING OF LARA Actress Angelina Jolie, star of the new action film "Lara Croft Tomb Raider The Cradle of Life" greets her co-stars Gerard Butler at the film's premiere in Hollywood July 21, 2003. The film stars Jolie as Lara Croft as she searches for the infamous site known as 'the cradle of life." The film opens July 25 in the United States. REUTERS/Fred Prouser
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Actress Jennifer Garner greets actor Gerard Butler at the Warner Bros./InStyle after party after the 67th annual Golden Globe Awards in Beverly Hills, California January 17, 2010. REUTERS/Mario Anzuoni (GOLDENGLOBES-PARTIES) (UNITED STATES - Tags: ENTERTAINMENT)
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Actor Gerard Butler (R) poses with a bagpipe player as he signs autographs before presenting the movie 'Coriolanus' at the 61th Berlinale International Film Festival in Berlin February 14, 2011. REUTERS/Thomas Peter (GERMANY - Tags: ENTERTAINMENT)
Manchester United Legends Roy Keane passes the ball as Celtic Legends Gerard Butler challenges during their charity soccer match at Celtic Park stadium in Glasgow, Scotland August 9, 2011. REUTERS/David Moir (BRITAIN - Tags: SPORT SOCCER ENTERTAINMENT)
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"At my sister's wedding I had to do the first reading, it was a Catholic wedding, there's, like, 400 people in the congregation. So I'm sitting, and my mum's in the front row and she's looking up at me, and I'm looking down at her. And my mum ... she does this pious like [puts his hands together] and I think she's telling me to pray. I think she's saying 'Please pray, you should be doing this'.

"So I'm sitting there and I put my hands together, and she goes 'No no no'. I look down, and my kilt is spread wide, facing the whole congregation. So I slowly like ... crossed my legs. We don't wear underwear under a kilt, you're not supposed to. I, definitely, that day, was not wearing underwear."

Gerard himself is not married, but previously said he was keen to start a family within the next five years.

Speaking in 2017, he said: "I have no personal life. In five years I want to be in a relationship. I'd love to have one or two kids - it's about time. I want to be more run by my personal life than my career."

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