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Aguilera cited "irreconcilable differences" in her divorce petition obtained by TMZ, which was filed today. It's an interesting twist, since sources tell us Christina is the one who cheated.

According to the divorce docs, there is a prenup. The divorce petition asks that "Earnings and accumulations of [Aguilera] before marriage, during marriage and from and after the date of separation" be considered separate property.

Aguilera, who is represented by disso-queen Laura Wasser, lists the date of separation as September 11, 2010.

The petition also seeks to terminate Bratman's ability to get spousal support.

Aguilera is seeking joint physical and legal custody of their child, Max, who is 2.

Sources connected with the couple tell TMZ the marriage fell apart after Aguilera allegedly cheated on Bratman. Aguilera's side refused comment.

• Christina Aguilera Splits From Husband
• Christina Runs Into the Arms of a Friend
• Christina's Husband -- Business As Usual

Question is ...

Jordan and Xtina were married in 2005 and have been separated for a few months.

The couple has been separated for a few months -- just like Courteney Cox and David Arquette.

There are no plans for divorce. But it's yet another 5-year itch. Ben Harper just filed for divorce from Laura Dern after 5 years.

Aguilera and Bratman have a 2-year-old son, Max.

The Aguilera/Bratman split was first reported by Us Magazine.

Last night, ex-hubby #2 was leaving Beso with his newer wife, Kelly A. Wolfe, when he told us what he thought about J.Lo.

Question is ...

After a comedy show in L.A. last night -- the gas master showed us a new iPhone app called "Fart Battles" -- in which flatulent fighters wage war by recording their own ass-music ... and then sending it to each other.

Sources say George and Ann have been working out details of the split "for a long time," but they've both made the decision to end the marriage.

The couple has been married for 17 years. They have a 14-year-old daughter, and we're told they both want to keep the divorce amicable for the sake of their kid.

UPDATE: A rep for George and Ann tells TMZ, "George and Ann Lopez have made the decision to end their 17 year marriage. The decision is amicable and by mutual agreement. They remain dedicated parents, and committed partners in business and their philanthropic organization, The Lopez Foundation."

Question is ...

Question is ...

It's somewhat surprising that the deal is only for one year ... given the nature of the "A.I." franchise.

Sources connected to the negotiations tell TMZ ... contrary to some news reports ... there has been no drama and no diva demands. As one source puts it, "It's been typical negotiating."

We're told ... absent a last-minute snag (which is highly unlikely) ... the deal could be inked as early as next week.

Sofia tweeted, "How can someone look so handsome after 6 hrs in an operating room???!!!!"

As TMZ first reported, 35-year-old Nick Loeb suffered a broken leg and a severe gash across his chest after the nasty car crash in Bel Air.

We'd be smiling at the camera too if Sofia were taking the picture.

Question is ...

Sofia was spotted driving out of the L.A. area hospital where Nick's recovering from a broken leg ... and pelvis, according to Sofia's Twitter.