Whitney Houston has fuelled reports of a romance with sex-tape star Ray J by flying all the way to Las Vegas just to hear the R&B singer belt out the American National Anthem.

Houston was spotted among the celebrities at the Joe Calzaghe/Bernard Hopkins boxing match on Saturday night, but she admitted she wasn’t in Vegas for the fight.

She said, "I’m here to hear Ray J sing." The couple has been linked romantically since Houston split from her husband Bobby Brown last year, but both have been coy about the rumors.

Recently, Ray J criticized Brown for his plans to bring out a book detailing private moments from his marriage to Houston, and featuring comments about his ex-wife’s new man.

Ray J has confessed he "loves" Houston in recent interviews, but he has refused to confirm the couple is an item.

Meanwhile, Ray J, who sang the National Anthem before Saturday’s big fight, and Houston weren’t the only stars sitting ringside - Arnold Schwarzenegger, Bruce Willis, Sylvester Stallone, Tom Jones, Catherine Zeta-Jones and Jay-Z were at the light heavyweight clash.