Is Cameron Diaz the New Jennifer Aniston?

After her breakup with Alex Rodriguez, Diaz is once again single.

Sept. 15, 2011 — -- intro: Cameron Diaz has broken up with yet another boyfriend.

The serial dater recently called it quits with her latest love, Yankees slugger Alex Rodriguez, after a year together, according to Us Weekly.

Despite their steamy beach getaways and Diaz's jovial relationship with Rodriguez's young daughters, work ultimately came between them, a source told the magazine.

"She's very busy with her career," the source said of the star of "Bad Teacher." "And he's had injuries and wants to focus on his game. They're dedicated professionals."

In the past, Diaz, 39, has made it clear that she would be OK without the whole marriage and kids thing.

"Marriage hasn't been important to me," she told Cosmopolitan magazine earlier this year. "And you can't have a child just because you think it's something you are supposed to do."

Sounds like another Hollywood star -- at least until recently. Jennifer Aniston seemed more attached to her hairstyle than she did to any one guy after her marriage to Brad Pitt ended in 2005. That changed after she met Justin Theroux. They have reportedly moved in together and tabloid headlines scream that Aniston is trying for a baby.

Looks like Diaz may have knocked Aniston off the throne as queen of Hollywood's single ladies. A look back at Diaz's past relationships before A-Rod:

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After Diaz's father, Emiliio Diaz, died in 2008, the actress seemed to keep her options open.

"I'm in love with love. I'm in love with life," she told W.

While she was linked to Bradley Cooper and model Paul Sculfor, it was Sculfor she stepped out with publicly and dated for the next year.

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After her breakup with Justin Timberlake, Diaz had a brief dalliance with singer-songwriter John Mayer -- another thing she and Aniston share in common.

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In 2003, Diaz was considered the older woman when, at the age of 30, she hooked up with 22-year-old Justin Timberlake.

Despite their age difference, the two seemed perfectly suited jetting around the world surfing and skiing, and equally dedicated to their careers. But after four years, they called quits on the relationship, though they continue to collaborate professionally, including in the recent film, "Bad Teacher."

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Diaz started her low-profile romance with actor and 30 Seconds to Mars frontman Jared Leto in 1999.

The actress would dodge her first wedding rumors, after wearing a $15,000 ring of rose-cut diamonds to the 2003 Golden Globes.

Their relationship lasted four years.

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Diaz met Matt Dillon in Minnesota, where they were both filming.

She was making "Beautiful Girls," he, "Feeling Minnesota" when they began their two-year relationship.

"I love him incredibly," she told Britain's Guardian in 1997.

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In 1990, a year after she was discovered at age 16, Diaz met and fell for video producer Carlos de la Torre, 27, while shooting an ad for L.A. Gear.

"I spent the entire day trying to get him to talk to me," she told People in 1994.

Diaz was still with de la Torre when she landed her first movie role, playing opposite Jim Carrey in "The Mask."

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