Hollywood's most eligible bachelorettes

　 Cameron Diaz
　
　

　 Natalie Portman
　
　

　 Rihanna
　
　

　 Lady Gaga
　
　

　 Anne Hathaway
　
　

　 Ashley Greene
　
　

　 Blake Lively

It seems like the stars are always hooking up, but there"s no shortage of famous female hotties still on the market. What the following celebs all have in common is that they"re all female, over the age of 20, and they"ve never been married or even engaged. Keep clicking to see some gals who"ve got it all -- except a ring on their finger. And they"re certainly not sweating it.

1. Cameron Diaz

Those legs. That smile! Those legs. Cameron Diaz is something of a serial dater, having romanced Justin Timberlake and Jared Leto, but she"s never made it to the engagement stage. For now, the 37-year-old is much more interested in having fun and kicking back with the ladies than settling down.

2. Natalie Portman

Hollywood starlets don"t get much classier than Natalie Portman, the Harvard-educated Oscar-nominee who keeps her personal life out of the press. Well, as much as possible: We do know she"s been linked to Devendra Banhart and, more recently, ballet dancer Benjamin Millepied, her choreographer from Black Swan. Wonder if he"s the one?

3. Rihanna

She may be romancing LA Dodgers player Matt Kemp at the moment, but Rihanna has said herself she"s keeping it casual. This pop beauty must be used to the boys knocking down her door, but lately she"s been more interested in touring and planning a bachelorette party for pal Katy Perry.

4. Lady Gaga

She"s not your average pop star, but the ever-eccentric Lady Gaga gets major props for being a true artiste. At 24 years old it"s no surprise she"s never been married, but she"s also remained largely unattached during her time in the spotlight. We can see how the fellas might be a little intimidated, but this songstress is still one of the most desirable gals in showbiz -- what are they waiting for?

5. Anne Hathaway

Anne Hathaway is a Hollywood princess if we"ve ever seen one -- with or without this legendary ball gown. Sure, her romantic life hasn"t been without bumps in the road (mainly that one big bump known as Raffaello Follieri, the fraudulent real estate developer). But these days she"s dating actor Adam Shulman and avoiding run-ins with the law, and she"s become a regular film darling.

6. Ashley Greene

Twilight hottie Ashley Greene is the object of every teen girl"s envy. Just look at the people she hangs out with: She"s besties with the permanently shirtless Kellan Lutz, and she was once caught smooching Chace Crawford. But for the most part, Ashley has preferred to keep her personal life to herself and focus on her career instead. Smart move -- she"s now working opposite stars like Hugh Jackman and Jennifer Garner.

7. Blake Lively

What"s not to love about Blake Lively? She"s tall, blonde and gorgeous, with a body to kill, and her post-Gossip Girl prospects are looking pretty good, with Green Lantern on the horizon. At 22, she has more than enough time to enjoy the single life, but she seems pretty comfy with her beau of three years, Penn Badgley.