It must be breakup season in Hollywood, because celebs like Jessica Simpson and Kim Kardashian found themselves suddenly single after Independence Day. Fitting, no?

If you’re looking for perpetual Miss Lonelyhearts Jen Aniston, serial monogamist Cameron Diaz or the no-longer-engaged Megan Fox, check out our previous list of Hollywood’s Hottest Singles.

Now here’s the latest crop of sexy singles who might be in need of some summer lovin’!

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KIM KARDASHIAN
The most famous of the Kardashian sisters shocked fans with news of her split from longtime boyfriend Reggie Bush. The couple seemed low-key and genuine during appearances on Keeping Up With the Kardashians, and had been dodging engagement rumors for months. Alas, ambition got the better of these two, as both attributed the split to the distance required by their careers. She’s a Hollywood girl filming a reality show, while he’s committed to playing football in New Orleans. Sometimes love just ain’t enough.

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LEANN RIMES
Seems this country crooner’s marriage to Dean Sheremet suffered from the Seven Year Itch. The onetime child star is all grown up and starring in a tabloid scandal worthy of a good country song. After starting an affair with co-star Eddie Cibrian on the set of a Lifetime television movie, Rimes graduated to homewrecker when Cibrian’s wife left him last month. Shortly after, she announced her separation from Sheremet. We have a feeling Rimes and Cibrian will be making beautiful music together before long.

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JESSICA SIMPSON
Poor Jessica Simpson. She gets dumped by Tony Romo the day before her 29th birthday and has to cancel her Ken and Barbie-themed party. Insult to injury! The famously ditzy blonde reportedly came close to snagging the handsome Dallas Cowboys QB as hubby No. 2 — Us Magazine reports that he had a ring — but seems to drive men away with her insecurity and neediness. (Not to mention her overbearing manager/father.) Seems not everyone has the endless reserves of patience of her first husband, Nick Lachey. Please, Jess, just promise us you won’t even think about going back to that cad John Mayer.

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VANESSA MINNILLO
Speaking of Nick Lachey, he’s fresh off a breakup as well. So look lively, boys, because that means Vanessa Minnillo is single. The tomboy cutie and former MTV host shared a love for sports with Lachey, but seems the longtime couple choked when it came to marriage. Minnillo has a history of dating athletes — notably, Yankees shortstop Derek Jeter — so here’s hoping her next relationship will have her batting 1.000.

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KRISTIN CAVALLARI
The spunky new star of The Hills is single like nobody’s business — or everyone’s business, as the case will be when she goes public with her love life on MTV’s reality hit, returning Sept. 29. Not only will she co-star with ex-boyfriend Brody Jenner, but rumor has it she’ll be stirring up drama by flirting with Audrina Patridge’s on-again, off-again bf Justin Bobby. In the meantime, she’s reportedly been cozying up to none other than Nick Lachey. Man, that guy gets around.

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RIHANNA
Since her infamous split from Chris Brown, Rihanna has been looking for someone to stand under her umbrella. In her apre time, she’s spent her summer getting a new tattoo (and tattooing other people — illegally), experimenting with her hair and wearing crazy outfits (like pasties under a blazer) in public. Meantime, her ex has unexpectedly found new relevance thanks to a YouTube wedding dance video set to his song “Forever.” Nothing says “lasting love” like dancing down the aisle to the vocal stylings of a girlfriend-beater.

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JANET JACKSON
It’s been a rough couple of months for Janet Jackson. First she lost brother Michael as the world watched. Then came the news of her split with boyfriend of seven years Jermaine Dupri. Dupri stayed by her side during her public weight battles and a flopped comeback album, but didn’t attend Michael Jackson’s funeral. At least she has two nephews and a niece to keep her busy now.

Tags: jessica simpson, kim kardashian, leann rimes, rihanna