Property tycoon Donald Trump is worried about pop star Britney Spears, after seeing her husband Kevin Federline spending her money on fast cars and designer clothes.

The apprentice reality TV star, who became a father for the fifth time to Barron William on March 20, admits he doesn't trust the unemployed dancer, who appears to be enjoying life to the full as Spears cares for their baby son Sean Preston.

Trump tells gossip site The Scoop, "What has happened to Britney? "She's put her very successful career on hold to get married and have a baby. Lots of women do that but there's something that just doesn't look right here. "The husband? I don't know. I've just never been a big fan. I hope he's OK. He certainly seems to be spending lots of her money."

When Spears and Federline announced their engagement in June 2004, Trump advised the TOXIC hitmaker to get a prenuptial agreement to protect her assets. Trump said, "I heard Britney Spears is not going to have a prenuptial agreement. She's making a huge mistake. Just a huge, traumatic and potentially ruinous mistake. You have to have it."