Heidi Montag drops to 103 pounds with 14-hour workouts

After being a daily tabloid staple, Heidi Montag and Spencer Pratt quietly dropped off the radar last year. Turns out Heidi spent that time at home, dining on pie and fried chicken. A return to the spotlight in a bikini had her hitting the gym -- hard!

Heidi Montag told Us Weekly, "I've been working out from, like, 5 a.m. to 7 p.m. for two months now. I've been working out really hard because I had this pool party and I was like, 'I have to be in shape.'"

The 5-foot-2 party girl continued, "And I was actually a lot overweight. It was the most I've ever been because I've kind of been in hiding, eating pie with my husband and puppies, so I needed to get back in shape."

Heidi Montag, who had 10 cosmetic surgery procedures done in one day in 2009, claims her highest weight was 130 pounds. After her all-day gym workouts? She's down 27 pounds and weighs just 103 pounds... with size F implants.

"My breasts, because they're so big, really needed some time," Heidi Montag explained of taking a year off from working out after her surgeries. "So I'm just starting to work out again after my surgery. Sometimes I get shooting pains, but I hear that's normal."

Also in Vegas at Sin City's Wet Republic on Saturday was Crystal Harris, Hugh Hefner's runaway bride. Booze, bikini babes and a heap-load of drama -- sounds like a Vegas party!