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.

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"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."

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