Major League Baseball commissioner Bud Selig has ordered New York Yankees star Alex Rodriguez to appear before investigators over allegations -- first published in Star magazine -- that he played an illegal poker game where cocaine was openly used and another which turned violent.

"We take this very seriously and have been investigating this matter since the initial allegation," an MLB spokesperson told Star, in an exclusive statement.

"As part of the investigation, the Commissioner's Office will interview Mr. Rodriguez."

Paris Hilton's sex tape partner, Rick Salomon, and The Hangover II star, Nick Cassavetes are also being sued -- in addition to Tobey Maguire -- over a high stakes illegal poker ring, RadarOnline.com can exclusively report.

Salomon is being sued for $23k and Cassavetes for $73k by investors in a hedge fund who are claiming that Brad Ruderman, who organized the poker games and was CEO of Ruderman Capital Partners, used their money for an elaborate Ponzi scheme that he hatched in order to fund his extravagant gambling habit.

EXCLUSIVE DOCUMENTS: Rick Salomon Sued Over Illegal Poker Ring

The lawsuit against Salomon states: "to recover the value of the 4-Year Transfers from Salomon for the benefit of the Estate, in the amounts of $23,000, plus interest at the maximum legal rate from the date of the 4-year transfers.." The court docs reveal that Salomon was paid $23,000 on April 18th, 2008.