#15 Kristen Stewart
Claimed to be a "modern-day mistress", the budding actress found herself in the spotlight earlier this year when she finally admitted she was in a relationship with her "Twilight" co-star Robert Pattinson. Unfortunately, the announcement came after it was revealed she had an affair with "Snow White And The Huntsman" director Rupert Sanders.
#14 Angelina Jolie
Though she insists she never chased a romance with Brad Pitt while he was married to Jennifer Aniston, Jolie did elope with actor Billy Bob Thornton while he was engaged to Laura Dern. But it's Hollywood, right? Engaged doesn't "count".
#13 Sienna Miller
Though she was cheated on by actor Jude Law with their children's nanny Daisy Wright, Miller was also caught in her own web at the time as she had a secret relationship with another actor (Balthazar Getty) who was also married and had four children.
#12 Monica Lewinsky
Politics and secret romances don't mix and obvious proof would be Bill Clinton's alleged affair with assistant Monica Lewinsky. Since becoming a pop culture joke, she eventually moved to England where she graduated from the London School Of Economics with a master's degree in social psychology.
#11 Marilyn Monroe
In her day, the Hollywood starlet/performer was tied to numerous married men such as Arthur Miller, Yves Montand and even Bobby and John Kennedy. The big question mark was whether Monroe actually saw herself as a married woman throughout her years.
#10 Rebecca Loos
Also a part-time model, Rebecca Loos worked for David and Victoria Beckham as a personal nanny/assistant, that is until word got out that Loos and the professional soccer player reportedly got intimate. Since then, she's been a common face on reality television.
#9 Leann Rimes
In 2009, country songwriter Leann Rimes showed that some mistresses could already be famous as her relationship with Eddie Cibrian went public. That same year, both Rimes and Cibrian ended their marriages and tied the knot in 2010.
#8 Rachel Uchitel
Uchitel was known for her romance with a married David Boreanez but she didn't blow up to a celebrity status until 2010 when she was the center of attention in the sports world and the center of Tiger Woods' flailing marriage.
#7 Sarah Symonds
Though in 2007, celebrity chef Gordon Ramsay and his family were anointed Celebrity Family Of The Year, it was at the same time that a years-long affair with Sarah Symonds. Turns out Symonds was a "professional mistress" who was also an author of the booked titled "Having an Affair?: A Handbook for the 'Other Woman".
#6 Michelle McGee
Also known as "Bombshell", tattoo model/spokesperson Michelle McGee was caught in a field of confrontation after she had an affair with Sandra Bullock's former husband Jesse James. Subsequently, Bullock divorced James because of the incident that went public.
#5 Stephanie Birkitt
Commonly known behind-the-scenes as David Letterman's intern, Birkitt was plasticized as the late-night host's off-screen affair after her ex-boyfriend allegedly attempted to extort Letterman with details about their relationship.
#4 Oksana Grigorieva
In most eyes, Mel Gibson is a devout father, Catholic and Australian-American actor but for a brief time, his image in 2009 was shadowed by a secret relationship with Oksana Grigorieva despite being tangled in a 29-year-marriage. The two now have a daughter name Lucia Anne.
#3 Camilla Parker Bowles
When Prince Charles was still with Princess Diana, his wife often mentioned that their relationship was a party of three as Camilla Parker Bowles was in an on-and-off relationship with Charles for nearly three decades. As time passed on, the two married and Camilla moved on from being "The Rottweiler" to the Duchess Of Cornwall.
