Kelly Osbourne: I Cried "Tears of Joy" After Bikini Shoot

Kelly Osbourne arrives at The 8th Annual Teen Vogue Young Hollywood Party at Paramount Studios on Oct. 1, 2010, in Los Angeles. Frazer Harrison/Getty Images

NEW YORK (CBS) Kelly Osbourne reportedly dropped 48 pounds since her "Dancing with the Stars" stint, and she revealed her first time in a bikini brought her to tears.

The TV personality said she cried "tears of joy" after donning the skimpy swimsuit for a Shape magazine cover shoot.

Pictures: Stars' Dramatic Makeovers

"Just got done shooting the cover of shape! I cried in my interview I just can't believe today happened it your not going to believe ur eyes!" Osbourne wrote on her Twitter page last Thursday.

""I just got done trying all the bikinis on I have never worn one in my life! I had a little tears of joy moment in the bathroom!" she added in another post.

She told Us magazine the next day that she had "never even thought" of wearing a bikini before the shoot.

"I cried when I saw the picture," the star, who now weighs 112 pounds, recalled. "Everyone that was there, we all just burst into tears. It was a thrilling experience."

Since "DWTS," Osbourne has continued to work with a trainer to stay in shape, she told the magazine.

"I just commit to half an hour a day. It doesn't seem overwhelming and I can handle that," she said. "I do half an hour on the treadmill and when I feel like doing more, I'll do a few sit-ups and some weights."

And the hard work is paying off.

"Now every designer will send me anything that I want, and I can't believe that I am in this situation," she said. "I opened up all of these zip bags last night from Marchesa -- off the runway -- and I can't believe that it fits me."