Prince William and his gal pal Kate Middleton celebrated a friend’s birthday party at Mahiki nightclub this past Thursday in Dover Street, London. Guests were required to wear a one piece outfit.

Prince William, 24, went as Superman while Kate, 25, dressed up in a pink dress.

A source for British tabloid The Sun said: “Prince William was absolutely hilarious. He bounded into the club with a blue muscle chest and red cape.

“He and Kate were on great form and were downing vodkas. They were quite touchy-feely and Wills had his hand on her bottom a few times during the evening — they looked like a young couple in love.

“Wills came in as Superman but left as Clark. And no one outside suspected a thing.”

Prince William and Prince Harry will be holding a concert to mark the 10th anniversary of the death of their mother, Princess Diana. “It’s got to be the best birthday present she ever had,” Wills said during an interview today. “We wanted to have this big concert full of energy, full of the sort of fun and happiness which I know she would have wanted. … The main purpose is to celebrate and to have fun and to remember her in a fun way.”

Who’ll perform at the concert? Duran Duran, Elton John, Bryan Ferry, Pharrell Williams, Joss Stone, and the English National Ballet. Composer Andrew Lloyd Webber will be doing a “greatest hits bit” from his musicals as well. Watch the video of Prince William and Prince Harry below!

P.S. I had absolutely no idea Wills‘ voice was so deep…

• Avril Lavigne continues to model, appearing in Canadian Elle (where else?).
• Prince Harry and Prince William take advantage of their ‘Prince’ status by groping Natalie Pinkham. I bet she’s got a nice story to tell now.
• The Duff sisters are annoying. And to add to it, they just came out with a new movie, Material Girls. Errrrrrrrr.
• American Gangster is filming in NYC and the streets are lined with some good ‘ol classics!
• Nick Lachey still doesn’t get it.
• I’d dare to say that Jessica Simpson’s hair stylist probably has a pretty good job.
• No wonder why Britney got pregnant so quickly after her first child. Kevin Federline has it in his contract to receive money for each baby he and Britney have together! WTH!
• Jessica Simpson wants you to help her pick her next single. Oh no. Oh no.
• Travis Barker, who split from Shanna Moakler recently has written a response about the whole ordeal on his Myspace. Myspace…my goodness.
• Watch Lionel Richie’s latest music video for his song, I Call It Love, featuring his daughter, Nicole Richie.

A shirtless Prince William turned up the heat at a sweltering polo match yesterday afternoon at Cowdray Park Polo Clubin West Sussex.  The 24-year-old prince changed out of his sweaty polo into a dry t-shirt and munched on some Toblerone white chocolate.  Prince William was participating in The Audi Polo Challenge Cup and met with producer/singer Pharrell as well as shoe designer Jimmy Choo (pictured in the gallery).  More pictures in the gallery!

London, England :: Former Atomic Kitten (UK pop group) Natasha Hamilton sure is one chick who’s made her dreams come true. Prince William, 23, got a little lip (and tongue) action over the weekend with Natasha, 23. The hunky heir leaned in for a polite kiss but Natasha couldn’t control herself and went in for the kill. Natasha even slipped in a bit of tongue at the last minute!  What will Will’s girlfriend Kate Middleton think?  Both kissed with their eyes closed!  That Natasha is a clever one… Prince William met Natasha in the backstage Green Room at The Prince’s Trust 30th Live concert held at the Tower of London this past Saturday.  More pictures in the gallery!

Stunning Kate Middleton showed off the figure that’s caught Prince William’s eye on their romantic Caribbean holiday yesterday. Wearing a flattering aquamarine bikini, the millionaire’s daughter, 24, watched admiringly as Wills, 23, played on a rope swing on their yacht. The university sweethearts are staying with a group of friends in an £8,000-a-week mansion on Mustique, the playground of the rich and famous. Yesterday they spent their time relaxing on the boat. The future king had fun leaping into the water off a rope on the rigging. He later hosed himself down to cool off. The night before, Wills grabbed the microphone at a beach-front karaoke bar and serenaded Kate. An onlooker said: "They were all having a great time. All the lads were urging William to get up and sing. He agreed and seemed pretty cool about the whole thing." 

LOVE BOAT :: Prince William and girlfriend Kate Middleton soak up the sun and have some fun while yachting around the Caribbean on Monday. The couple have been staying at an exclusive resort on the island of Mustique during their weeklong romantic getaway. More pictures in the gallery!