Hayden Panettiere lost her cool at an event in Hawaii over the weekend.

The 19-year-old Heroes star — who recently split with Milo Ventimiglia because of her club-going ways — was testy when she first stepped on the red carpet at a fundraiser benefiting the Rehabilitation Hospital of the Pacific Foundation Sunday in Honolulu.

“Back up!” she yelled at photographers.

After posing for photos, she brushed by reporters.

A female television reporter touched her shoulder and asked, “May we talk with you, Hayden?”

Miffed, the actress jerked her head around and screamed, “Don’t you ever touch me!”

She then icily asked a red carpet handler, “Oh, am I supposed to do interviews?”

Approaching various media outlets, she snapped again: “You all make my life miserable” and refused to answer any questions.

After the red carpet, Panettiere hung out in a private cabana with Justin Long and his brother. She then moved to a private dining room, where she and Long sat across from one another, chatting for more than an hour.

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Just hours before taking the stage, pop singer Britney Spears made a surprise visit to a group of sick children at Miami Children’s Hospital.

The 27-year-old Spears posed for photos with the children on Saturday.

She’s also donating $100,000 to the Big Apple Circus Clown Care program, which brings clowns to young hospital patients.

Spears played at the American Airlines Arena in Miami as part of her “Circus” tour.

The tour to support her hit album of the same name kicked off last week before a nearly sold-out crowd in New Orleans.

Spears’ last toured in 2004.

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The Bachelor’s Melissa Rycroft is on the rebound after being dumped by fiance Jason Mesnick last week: she’s joining Dancing With the Stars.

Rycroft, 25, will step in for Nancy O’Dell, Access Hollywood reports. O’Dell quit on March 5 with knee problems.

When contacted by Usmagazine.com, a network rep said: “ABC is not commenting, and asks viewers to watch Monday’s show.”

Us first reported that Girls Next Door star Holly Madison will replace Jewel, who also withdrew from the competition with knee issues.

“When the doctors told me my injuries were so severe that I couldn’t walk, let alone compete, I was devastated that I couldn’t continue the show,” said Jewel, who was diagnosed with a fractured tibia in both legs.

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SEAN “Diddy” Combs had no idea Chris Brown was going to use his home on Star Island to stage his reconciliation with Rihanna for the paparazzi. A music industry insider tells us, “Chris called and said he needed to crash at Diddy’s house while he was recording. He said it would just be him and his mom.” In fact, Brown, who just got charged with two felonies for allegedly beating up Rihanna the night of the Grammys, brought her down and called the photographers. “Chris is a dog,” another spy said. “He’s always been so critical and nasty to Rihanna, making fun of her accent.”

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Late night host Jimmy Kimmel and comic Sarah Silverman have called it quits again, a source tells Usmagazine.com.

The couple, who have been dating on-and-off for the last few months, started dating six years ago.

“Sarah initiated the split this time,” the source tells Us. “He’s bummed.”

This breakup happened within the last two weeks.

“He’s really blue — very down,” another source tells Us. “Seems like it’s over for good this time. He’s sad because he just bought a new place and now has nobody to share it with.”

The couple, who first split in July, reunited last fall.

“We’re just being right now,” Silverman told Us in November.

The pair met during a roast for Hugh Hefner, where Silverman told the audience he was fat and joked he had no charisma — but that didn’t stop them from working together.

“He hired me to do voices on [Comedy Central’s] Crank Yankers and around the second season of that we started hanging out,” Silverman has said. “A while after that he kissed me.”

Kimmel separated from his wife Gina in 2002 after 14 years of marriage. Silverman has said she wouldn’t consider getting married until gay marriage is legalized.

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Paris Hilton and Doug Reinhardt made out at “My House”.

It is about time Paris found a HOT HOT guy, because I just freakin fell in LOVE with Doug Reinhardt…this dude is such total hotness! Thank goodness it wasn’t my ACTUAL house, because I probably would have called in a hazmat team to clean it up this morning.

Anyway, Paris Hilton and her latest boytoy stopped by Hollywood hotspot My House last night, and Paris looked oh so virginal and sweet in this off white outfit. Oh, who am I kidding?

The dynamic duo kept their PDA to a minimum on the way out of the club, but once they got inside the chauffeured SUV, they couldn’t keep their hands tongues off of each another. Seriously guys, get a room…we don’t want to watch you swapping saliva…

Doug, for the record, I’ll swap saliva with you ANY day.

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