Britney Spears ex-husband Kevin Federline may have just been given the boost he needs to kick start his weight loss plan - $2.5 million!

This is reportedly what the roly-poly ex-husband has been offered to endorse a new fat-burning tool set to go on sale in GNC health food stores in the US.

A rep for EP-2 (Extreme Physical Performance), the company behind the product, tells RadarOnline.com: “Yes, we’re trying to do a deal with him, but nothing has been confirmed yet.”

Well-Fed: Kevin takes the kids to Starbucks in Paris in July

The former dancer's weight has ballooned since his divorce from Britney in 2007.

From hunky to chunky