Rumors have been circulating that the marriage of longtime Hollywood couple Antonio Banderas and Melanie Griffith is on the rocks, and the actress was seen last week without her wedding ring.

The heading-for-a-split rumors hit a fever pitch amid reports Banderas cheated on Griffith in Cancun. The couple have been married for 15 years -- a long time by Hollywood standards. And the "Desperado" star is working his charms, and trying to quell rumors of a potential split, according to several reports on Wednesday.

Woman's Day posted a video reportedly showing Banderas kissing another woman at Congo Bongo in Cancun in April. Banderas is 51 and Griffith is 54.

"They kissed more than once," a witness told Woman's Day. "At 2 a.m., Antonio and his beautiful blonde left together."

Another witness said, "There was so much chemistry that I wouldn't like to say what might've happened next. He was acting like a single man. His wife would be heartbroken if she had seen him that night."

This isn't the first time the couple's marriage has been rumored to be on the rocks.

Earlier this year, Griffith walked off the set of "The Hot Flashes" and quit the movie due to "creative differences"; however, friends expressed surprise at her frail frame, blaming stress from rumors of Banderas' philandering, reports said earlier this year.

"Antonio's begged Melanie to eat more and take better care of herself," a source told Woman's Day.

The publication said Banderas also possibly cheated on Griffith in 2007, when the actor was promoting "Shrek The Third" in Mexico. He was "spotted at an intimate dinner with a mystery woman."

In light of the alleged philandering in Cancun, Banderas has been trying to persuaded his wife not to leave him, according to Radar Online.

"Antonio has been desperately trying to win Melanie's trust back," a source told the gossip website. "He has been doing everything in his power to revive the romance -- flowers, sweet-talking on the phone, and extravagant gifts -- because he realizes that she is close to her breaking point."

Pictures of Griffith without her wedding ring surfaced last week, suggesting to the rumor mill her marriage to Banderas is on the rocks.

"She is playing hard to get," a source told Radar Online, indicating that the ring wasn't being worn as a sign Griffith wasn't giving up easily.  "She has always known how to keep him on his toes and it wasn't a coincidence that the cameras caught her with her wedding ring off! Ultimately she will probably stay with him but not before making him squirm."

According to a Radar Online source, Banderas is desperate to avoid a divorce.

"The last thing Banderas wants is a nasty high-profile divorce," the source told the gossip site.  "Despite their problems he still loves her and will do anything to keep her from leaving him."

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