Cat Fight

Jessica Simpson and Carrie Underwood are becoming quick rivals, as the two continue to trash talk each other and fight about whether Tony still keeps in contact with his ex.

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OK! exclusively reported in May, Tony still contacts Carrie. "They talk and text regularly," a source tells OK!. "They broke up as friends, so there's no reason for them not to talk."

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"I looked at his call log," Jessica told listeners during an Aug. 20 interview with a Nashville radio station. "Tony and I both laughed" at Carrie's assurstions that she still talks to Romo. "We got a chuckle out of it," Jessica said.

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A friend of Carrie Underwood tells OK!, "She's livid that Jessica would feel the need to publicly try and embarrass her when it's Jessica who should be embarrassed. Her boyfriend is calling Carrie behind her back!"

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Another source admits that Carrie is adding fuel to the fire, "Carrie thinks Jess is a big bottle of bleach and a pair of high-heeled cowboy boots trying to ride off of the fame of Newlyweds." Ouch!

Edward A. Ornelas, San Antonio Express-News/ZUMA Press

Romo and Simpson celebrate Romo's 28th birthday with a kiss at a Dallas nightclub in April.

Robert Hart, ZUMA Press

The NFL quarterback and singer, seen here enjoying Romo's birthday cake, first started dating in November.

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Romo and Simpson cheer a three-point shot by the Dallas Mavericks in a game against the Los Angeles Lakers in March.

Ron Jenkins, Fort Worth Star-Telegram/MCT