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Jennifer is reportedly pocketing a million bucks for her performance. Our wedding spies tell us there are roughly 300 people attending the bash.

A source connected to Jennifer calls the performance time "a little weird," but hey, drunk or not, a million bucks is a million bucks.

Fun fact ... the World Health Organization has rated the Ukraine as #1 in the world for alcohol consumption among youth.

While reports linked the 41-year-old mother of two with William Levy -- the hottie in her latest music video -- he denies there has ever been anything but a professional relationship between them.

Jennifer and husband Marc Anthony released a statement on Friday saying they were ending their seven year marriage.

The guy at the center of the affair rumors is telenovela star William Levy -- aka the Cuban Brad Pitt -- who recently separated from his wife AFTER shooting the music video (see below) with Lopez.

But Levy's rep tells TMZ William and J.Lo are NOT an item ... saying, "The only relationship there was or is, is a professional relationship. That’s all there’s ever been.”

According to our sources at Rob and Jeanine McCool's wedding ... Bieber and Gomez were strolling on the beach when they heard Justin's hit "One Less Lonely Girl" playing at the reception -- inside the historic and shi shi Adamson House.

We're told Justin snuck up on some guests -- who predictably OMG'd and LOL'd -- and then hopped on the mic, saying ... "We just crashed it. We heard a party so we decided to just come. So let's party."

Turns out JLo and the kids spent the holiday at the beach in Malibu -- and Marc Anthony was nowhere in sight.

We're told JLo showed up with some family and friends, parked herself on the beach and enjoyed a little vino ... not looking upset at all.

JLo and Marc announced yesterday they were divorcing after seven years of marriage.

The couple just released a statement, claiming, "We have decided to end our marriage. This was a very difficult decision. We have come to an amicable conclusion on all matters."

The story was first reported on People.com.

This will be Jennifer's THIRD divorce -- she was first married in 1997 to Ojani Noa, and again in 2001 to her backup dancer Cris Judd. This will be Marc's second divorce.

The couple got married in 2004 in their Beverly Hills home. They have two children.

Marc and JLo renewed their vows just last year on their 6th anniversary -- and back in May, they gave a steamy performance together on the season finale of "American Idol."

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More Today in TMZ History

Justin and Selena hit up Lucky Strike, Downtown -- where they performed their own rendition of the Kid Rock/Sheryl Crow duet, "Picture."

But their curfew must have been pretty strict -- because J&S didn't linger ... hitting the road before midnight.

Serrano had filed for divorce back in November -- citing "irreconcilable differences" ... and according to court documents filed this afternoon, the marriage is officially over and out.

According to the report, after Rubio got into a car accident, the first officer on scene instructed her to get out of her car and onto the sidewalk. Rubio refused to get out of the car, the report states, at one point cursing at the officer in Spanish.

Once the officer told Rubio she was under arrest, got her out of the car, and placed the handcuffs on her, Rubio screamed out, "Help! Help! I didn't do anything! Look what they're doing! Help! Abusers! You bunch of liars! Help!"

The report says Rubio continued to yell at the officers even from inside the patrol car. An hour later, according to the report, Rubio calmed down and apologized. The officer says he issued her a summons to appear in court, and didn't take her in to jail, because she claimed to have "an extenuating circumstance (she breast feeds her 6 month old child)."

As TMZ first reported, Rubio was charged with disorderly conduct, obstruction of justice and refusal to obey a lawful command.

Law enforcement sources tell TMZ ... Rubio was involved in an accident just blocks away from the ocean in Miami.

According to law enforcement, the accident was relatively minor -- and Rubio was not at fault -- but she got into some kind of argument with officers on scene and was subsequently arrested.

We're told she was busted for disorderly conduct, obstruction of justice and refusal to obey a lawful command -- but the charges were small enough that Rubio was not taken into custody. Instead, she was issued a summons to appear at a later date.

Sources at the couple's hotel tell TMZ, they stayed for 5 days in a 3-floor villa at the swanky Kivotos Mykonos hotel -- from June 15th to June 20th -- which normally runs $5,190 a night.

Out of sight!

UPDATE: Jennifer's people tell us they've seen the unblurred photo and insist Lopez is wearing "clothing tape."

J.Lo explained the whole thing to BBC Radio -- saying, "I haven't been forced to make a decision and I'm glad about that because honestly I'm very on the fence about it."

Lopez added -- "I loved it, but I have a lot of other things happening, and it's going to come down to me making a choice of what I want to do for the next year."

One of those "other things" J.Lo is working on is her OWN singing competition show with hubby Marc Anthony -- called "Que 'Viva!: The Chosen". The show will focus on undiscovered vocal talent in Latin America.

FYI -- J.Lo reportedly made $12 MILLION for her role as a judge on AI this season.