Brooklyn Decker is very proud of her friend Kate Upton.

The 25-year-old 'What To Expect When You're Expecting' star - who is married to tennis player Andy Roddick - admits she is blown away by how successful the 20-year-old model has become.

She told E! News: ''Look at her, I mean she's on top of the world. The girl's doing something a model hasn't done in years - be on the cover of British Vogue, shoot American Vogue and then be on the cover of Sports Illustrated. She's really - for lack of better words - kicking butt in the business and I'm just so proud of her. To be as young as she is and as strong as she is as a model. It's really exciting I think for girl's following in her footsteps.''

Brooklyn, who used to model before becoming an actress, also praised Kate's picture on the cover of the latest Sports Illustrated magazine, which was shot in Antarctica and is her second consecutive time being the cover star for the annual swimsuit issue.

She said: ''I mean I love the cover, to be honest, I think this year's far exceeds last year just because the location is so incredible and you can tell...She's growing into a woman and just become more and more beautiful, so I definitely like this year's better but I think both are just stunning. I'm proud of her.''