Heidi Montag celebrates her 21st birthday in Las Vegas performing her new single for the first time followed by a party at LAX n

September 16, 2007

LAS VEGAS, NEVADA. Saturday, September 17, 2007. Heidi Montag celebrates her 21st birthday in Las Vegas performing her new single for the first time followed by a party at LAX nightclub. Montag and fellow Hills star and boyfriend Spencer Pratt had a dinner with friends including celebrity blogger Perez Hilton at Social House inside the Treasure Island hotel in Las Vegas before heading to LAX nightclub at the Luxor hotel in a stretch limousine. Heidi performed her new single which went down well with the crowd, then the couple shared Champagne and other drinks with revelers in the club from their VIP lounge. The couple appeared to be in high-spirits and very much in love, dancing the night away before heading back to their hotel room about 3am.