Sounds like Fergie's big Sin City celebration tired her out. After the birthday girl left Vegas, she headed to Scottsdale, Ariz., with fiancé Josh Duhamel for a quiet and romantic getaway. The couple arrived at the Mondrian hotel on Friday, where yet another birthday party was planned for Fergs at Asia de Cuba restaurant.

But the bash was canceled last minute, and they opted for room service instead. Apparently, Fergie wasn't feeling so well. "She requested only bland foods be brought to her room, like chicken broth, plain chicken and rice," says a source. She did manage to make it to the Tempe Music Festival on Saturday night where she was scheduled to perform.

But other than a brief appearance at the pool, where Josh was spotted doting on his g-f, the twosome holed up in their 1,500-foot luxury suite. With two 42-inch-plasma TVs, three private balconies and dual showerheads in the posh room, we can't really blame them.

—Additional reporting by Claudia Rosenbaum