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Justin Timberlake and Cameron Diaz had a high-profile relationship for three years that ended in 2006, but the former couple had no problem promoting their 2007 movie "Shrek the Third" together. They're also costars in the comedy "Bad Teacher." (Franco Origlia/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
If there's anything worse than a nasty breakup, it's having to go to work after a nasty breakup ... then seeing your ex right there in the office ... then reading about it the next day in the papers. The celebrities in this slideshow loved, split, then worked together all under the glare of the media spotlight. And few did so with better results than Lucille Ball and Desi Arnaz, who built a media empire around her comedic talents that outlasted their 20-year marriage. (Leonard McCombe/Time and Life Pictures/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
Singer Marc Anthony and singer/actress Jennifer Lopez were married for more than seven years and had twins before they announced they were separating in July 2011. They still have to face each other professionally as fellow stakeholders in the Miami Dolphins and as co-producers of the international talent show "!Q'Viva!," and as co-partners in Lopez-Anthony-branded fashion and home lines for the department-store chain Kohl's. (MARK RALSTON/AFP/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
Childhood friends Blake Lively and Penn Badgley reconnected on the set of "Gossip Girl," and dated for three years before splitting up in September 2010. The co-workers remain close friends, their reps say. (Jeffrey Ufberg/WireImage/LIFE.com) Visit LIFE: Your World in Pictures
Justin Timberlake and Cameron Diaz had a high-profile relationship for three years that ended in 2006, but the former couple had no problem promoting their 2007 movie "Shrek the Third" together. They're also costars in the comedy "Bad Teacher." (Franco Origlia/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
Jennifer Garner and Michael Vartan dated from mid-2003 to mid-2004, but continued working together on "Alias" till its demise in 2005. (Frederick M. Brown/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
Diane Keaton and Woody Allen were famously coupled up in the early '70s, and the classic "Annie Hall" is considered a largely autobiographical take on their relationship and its disintegration. They continued working together until 1979 even though they were no longer lovers, took a break as collaborators in the 1980s and early 1990s, and then finally teamed up again onscreen in 1993 for "Manhattan Murder Mystery." (United Artists/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
Bandmates Tony Kanal (second from left) and Gwen Stefani dated for years, but Kanal broke up with Stefani while they worked on their third album. He offered to leave the band, but she insisted he stay. She also wrote plenty of songs about the split, including the hit "Don't Speak." Which must've been fun for him. (Ron Galella, Ltd./WireImage/LIFE.com) Visit LIFE: Your World in Pictures
In a tell-all book, Boy George said he had a relationship with bandmate Jon Moss (clasping Boy George's hand here in 1983), but that drummed Moss who, ashamed of the gay romance, fled into the arms of women, including the one he married and had three kids with. (Moss denied a relationship with George.) George later said they could've still been together if he'd only kept quiet. They still, however, toured after their alleged relationship ended. (Michael Putland/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
Famous on-again, off-again couple Richard Burton and Elizabeth Taylor ended their second and final marriage in 1976, but starred together onstage, including in Noel Coward's 1983 play "Private Lives." (AFP/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures
Jack and Meg White were married in 1996 and divorced in 2000, but the end of their romance doesn't seem to have affected their professional relationship as bandmates. (Scott Gries/Getty Images/LIFE.com) Visit LIFE: Your World in Pictures