Kris Jenner is slated to be feted at a $2 million bash marking her 60th birthday.

According to TMZ, all six of her reality TV show kids chipped in to meet the event's costs, including the rental of a giant West Hollywood stage spacious enough to accommodate up to 300 guests.

The theme of the bash is rumored to be "The Great Gatsby," and several big name stars are reported to be scheduled to perform. In addition, son-in-law Kanye West, close pal Melanie Griffith and boy toy Corey Gamble are all expected to be on hand.

Radar Online is reporting the much younger Gamble has also taken to sporting a wedding ring, prompting much speculation about the real status of his ongoing relationship with Jenner.

"Kris forced Corey into wearing the ring because she wanted to see how the public would react to them being married before the actual scripted proposal takes place," a source said. "She wants to make him her husband, but first needs to know how it will affect her brand and the brand of her empire."

Indeed, recent ratings for the family's "Keeping Up With the Kardashians" reality show are said to be on the decline, perhaps leaving the ever-plotting momager looking for ways to jump-start renewed interest in the show. Numbers for this season are reported to have hit an all-time low, dropping by double-digits among the critical 18 to 49-year-old demographic.

Given that Gamble is 26 years her junior, Jenner is said to be concerned the public might view their relationship as a case of a "sugar momma takes on young stud."

Jenner's ex Caitlyn Jenner is also expected to attend the birthday celebration, as is youngest daughter Kylie's rap star boyfriend Tyga.