Kelly Osbourne: Wow, I fit into a bikini now!

'I cried when I saw the picture,' the reality star said. 'Everyone that was there, we all just burst into tears. It was a thrilling experience.'

Slipping into a two-piece was a new thrill for her, she admitted to People magazine.

'I have never worn a bikini in my life before yesterday,' the 25-year-old said. 'I never even thought of wearing one!'

Osbourne’s stint on Dancing with the Stars in 2009 saw her lose 48 pounds, and she says regular workouts have helped her keep the weight off.

'I just commit to half an hour a day. It doesn’t seem overwhelming and I can handle that,' she told Us magazine. '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.'

Her svelte figure now makes her a hit with couturiers, something that still comes as a shock to her.

'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.'