Spencer Pratt celebrates his 30th birthday with a big bang and a huge cake with his wife Heidi Montag on top of it. With a larger than life champagne bottles and a couple of wardrobe changes, the former MTV reality star was treated by his wife with a sweet surprise in Las Vegas.

Pratt wasn't expecting that his wife will be jumping out of cake to surprise him and of course, she managed to grab the spotlight in her own way. It seems that the celebration is only for the couple with no guests to impress as she came out of the cake, with only a photographer to capture the moment.

"The Hills" star is wearing a midriff-baring red dress clad with glitters and emerged from the top of a giant silver cake. The sweet treat is decorated with the venue's logo (Crazy Horse) in black "icing" with a special message, "Happy 30th Birthday, Spencer! Love Heidi."

She even managed to tweet, "Jumping out of a cake @CRAZYHORSE3LV! Thank you!"

"Nothing better than @heidimontag popping out of a cake for your birthday, right @spencerpratt?" Crazy Horse III tweeted on Aug. 31. "So many kisses for the birthday boy! Happy birthday @spencerpratt! We are so happy to have you & @heidimontag here!"

The couple capped off the celebration with a real cake and champagne with another wardrobe changes before calling it quits. She slipped into a semi-sheer mini-dress with strategically-placed silver sequins and a plunging neckline that compliments her assets.

This will be one of Pratts birthday celebration series for his actual birthday was a few weeks ago, on August 14. Their fist party was celebrated on August 15 with a retro-themed cake.

"Happy 30th BIRTHDAY to the love of my life, my hero, my inspiration, miracle, angel!" Montag tweeted to her husband. "The best is yet to come! You are my present every day."

They've been married for four years after they eloped in 2008 and made it legal with a traditional church ceremony in April 2009. The couple was last seen in NBC's reality series, "I'm a celebrity...Get Me Out of Here!" but decided to quit the show after Heidi was hospitalized for gastric ulcer.