9 Hollywood Love Triangles We Didn't Know!

#1. Sienna Miller, Jude Law and Daisy Wright

Just like with Uma and Ethan's case, a nanny was also involved. Everyone had high expectations of Jude Law and Sienna Miller's seemingly ideal relationship, even to the extent of Jude popping the question on Christmas Day 2004. However, the only thing Jude did was to apologize in public about getting involved with nanny Daisy Wright, causing their breakup in 2006. However, Sienna and Jude did try to make things work in 2009 and separated for the last time in 2011.

#2. Mary Louise Parker, Billy Crudup and Claire Danes

Crudup and actress Mary-Louise Parker had been together for about eight years and she was pregnant--about seven months along--back in 2003, with their first child. Claire Danes and Billy Crudup met on the set of the film Stage Beauty, and Crudup left Parker for her shortly thereafter.

#3. Ethan Hawke, Uma Thurman and Ryan Shawhughes

Ethan Hawke and Uma Thurman met on the set of Gattaca. They married, had two children and seemed very much in love. Untilthey weren't. They couple split and Ethan Hawke began a relationship with the couple's nanny Ryan Shawhughes. While both Ethan and Ryan swear nothing happened until after the divorce, it seems pretty suspicious, especially when Uma mentioned that there had been a betrayal in the marriage. Ethan and Ryan are now married.

#4. Heather Locklear, Richie Sambora AND Denise Richards

After 12 years of marriage, in 2007, rocker Richie Sambora and the timelessly hot Heather Locklear filed for divorce, citing irreconcilable differences as the cause. Just months after the split, the legendary Bon Jovi guitarist began dating one of Locklear's best friends in the world, comparably hot actress Denise Richards, who, after a tumultuous break-up with Charlie Sheen, found herself newly single as well. The hook-up effectively put a temporary end to the long-time friendship of Locklear and Richards. And although everyone has since reconciled and are on good terms, for a while there, Heather wanted both Sambora and Richards more dead than alive.

#5. John Mayer, Giada de Laurentiis, and Todd Thompson

Giada De Laurentiis and John Mayer, Katy Perry's boyfriend, have been friends for years now, and it has been previously rumored that she cheated on her ex-husband, Todd Thompson, with the singer.

#6. J.C. Chasez, Eva Longoria, and Tony Parker

Eva Longoria loves playing the heartbroken victim of her breakup from philandering ex-husband Tony Parker, with whom she split in 2011. What she doesn't always mention is that she actually first hooked up with Parker in 2004 while she was publicly dating a famous NSYNC singer. No, not that one. That other NSYNC singer: J.C. Chasez. What goes around comes around, but sometimes it takes about seven years.

#7. January Jones, Bobby Flay, and Stephanie March

There were rumors stating that Bobby Flay cheated on Stephanie March before their divorce, and that's why the divorce papers took everyone off guard. It could also explain why Stephanie March is left high and dry in the divorce settlement, and why she didn't plan ahead concerning the divorce especially since she reportedly has a sick mother to take care of.

See, if Stephanie was the one who cheated, she would have planned ahead and made sure their prenup put her in a better place, right? However, instead of doing that, she's only NOW bringing up all the issues. Plus, her team has been dropping hints all over the place concerning Bobby Flay's cheating and infidelity, with Eylse Tirrell being the ‘other woman.'

#8. David Spade, Lara Flynn Boyle, and Jack Nicholson

There have long been rumours that there was a love triangle between David Spade, Lara Flynn Boyle and Jack Nicholson in the late Nineties.

The 51-year-old funnyman finally confirmed there was indeed one, but he was on the losing end of it.

The Just Shoot Me star - who has dated a bevy of Playboy models during his three decades in Hollywood - confessed that the notorious Chinatown star lured away his pretty brunette Twin Peaks girlfriend of one year.

'Nicholson asked Lara Flynn Boyle out in front of me, while we were all smoking a doob somewhere,' the Saturday Night Live veteran said.

#9. Robert Pattinson, Kristen Stewart and Rupert Sanders

Just when everyone thought it was going so well, Robert Pattinson and Kristen Stewart have reportedly 'split up' for the second time.

They saved their relationship after Kristen made a shock confession that she cheated on her long-term boyfriend Rob.

The 22-year-old was pictured kissing married film director and father-of-two Rupert Sanders and was forced to release a public apology.