Former US first daughter Chelsea Clinton has been told by users of a dating website that she can do better than the man she is marrying.

CanDoBetter.com, a social networking and dating site, carried out a survey on almost 5,000 people from around the world on whether or not Clinton, 30, and fiance Marc Mezvinsky are a perfect match.

The results showed that more than half feel the two are not suitable for one another, and only 16 percent of the users who voted said that the two were a good match.

Forty-seven percent said that Clinton could do better, while 38 percent thought that Mezvinsky could do better.

"It's the wedding of the decade with Oprah Winfrey and (former) British Prime Minister John Major among the reported 500 celebrity and political guests invited," CBS News quoted Dino Luzzi, CEO of Blast Applications, as saying.

"Hopefully by July 31, members and users of CanDoBetter.com will see this as a perfect match and they will be happily married for many years," Luzzi stated.

Clinton and Mezvinsky are marrying on July 31 in what is expected to be a lavish affair in Rhinebeck, N.Y. (ANI)