Adriana Lima was worried she would lose her figure after having a second child.

The stunning brunette - who has been working for lingerie brand Victoria's Secret since 2000 - had her second daughter, Sienna, with husband Marko Jaric in September 2012, and was worried about how it would affect her body and career.

She explained: ''You can't fight nature! I had no idea what was going to happen to my body after I gave birth for the second time, and whether I'd be able to get back into shape or how fast.''

Adriana - who is already mum to three-year-old Valentina - opened the runway show for Victoria's Secret two months after having Sienna and a combination of determination and hard work helped her get her figure back.

She told ''It was the biggest challenge in my life, for sure ... I decided to set that challenge for myself and it really gave me a goal to work towards for getting my body back in shape.

''I did the best that I could, and luckily I was a part of the show. It was a really a great, but tough experience for me. I had my trainer Michael Olajide, Jr. come to Miami and we were working out - but it wasn't easy. With a newborn and an almost three-year-old, to find time to work out isn't easy.''