Britney Spears, who is out promoting her new album, “Femme Fatale,” appeared on “Jimmy Kimmel Live” on Tuesday night. So did “Jackass” star Johnny Knoxville.

As part of her appearance last night, Britney filmed a sketch showing her “deleted scene” from “Jackass 3D” where she performed a stunt called “Poo Cocktail Supreme” — the flying porta-potty stunt Steve-O did in the movie.

MTV also debuted the trailer for their special, “Britney Spears: I Am The Femme Fatale,” check that out here!

Photos: Fame

Johnny Knoxville is the king of shenanigans, but let’s hope he sets aside his antics today when he marries Naomi Nelson, his longtime girlfriend and the mother of the second of his two children.

Life & Style has exclusively learned Naomi and Johnny will walk down the aisle today, just two days after Naomi personally selected her 2.5-carat Edwardian engagement ring from Platt Boutique Jewelry in LA.

An insider tells Life & Style, “They actually picked out Naomi’s engagement ring two days ago [Sept. 22], and they’re getting married today!”

Johnny (real name: Phillip John Clapp) and Naomi have been dating for about two years and had their first child together, Rocko Akira Clapp, on Dec. 20, 2009. Rocko is Johnny’s second child; he has a teen daughter, Madison, with his ex-wife, Melanie Clapp.

Source

It’s a boy for Johnny Knoxville and girlfriend Naomi Nelson.

The couple welcomed son Rocko Akira Clapp on Sunday night in Los Angeles. The baby weighed in at 8 lbs., and measured 20 inches long. Both mother and son are doing well, reports the Los Angeles Times.

In announcing the pregnancy in August, the actor and former Jackass star, 38 – whose real name is Phillip John Clapp – said he was “excited as hell” to meet his baby-on-the-way.

Rocko joins Madison, Knoxville’s 13-year-old daughter from a previous marriage.

Source, Bauer-Griffin

What a father figure!

Jackass star Johnny Knoxville is going to be a dad for the second time, his rep confirms to Usmagazine.com.

His girlfriend of nearly a year, Naomi Nelson, is three months pregnant.

“Yes, they are expecting and very excited,” his rep tells Us.

Knoxville already has a 13-year-old daughter, Madison, with ex-wife Melanie Clapp. He and Clapp wed in May 1995 and were married for 12 years before separating in July 2006. One year later, Knoxville filed for divorce, citing irreconcilable differences.

Source, Bauer-Griffin

Johnny Knoxville is officially single again.

His divorce from wife Melanie, was finalized in a LA court on July 24. The Jackass star agreed to pay his ex $6,000 a month in child support. Melanie will also reportedly receive half of his residual payments from the Jackass franchise and 2005′s Dukes of Hazzard movie.

The couple, who have a 13-year-old daughter, tied-the-knot in 1995 and filed for divorce in 2007. They have agreed on joint custody of their daughter, Madison.

Source, Bauer-Griffin

Jackass star Johnny Knoxville is legally single after nearly 13 years of marriage, court documents show.

Knoxville (real name: Philip John Clapp) filed for divorce from Melanie Lynn Clapp on July 3, citing irreconcilable differences.

The former couple have one daughter together, Madison Tatiana Clapp, 12.

Although their martial status ended last Thursday, their finances, custody arrangements and child support have yet to be settled. In his divorce filing, Knoxville requested joint legal and physical custody of their daughter.

Knoxville, 37, is best known for MTV’s Jackass, as well as a starring role in The Dukes of Hazzard.

Knoxville and his wife married in May 1995 and separated in July 2006.

Johnny Knoxville’s rep confirms that the Jackass star is calling it quits on his marriage. “They have been separated,” Amanda Silverman, Knoxville’s rep, says.

Knoxville, 35, and his wife Melanie have been married since 1995, but rumors of infidelity reportedly have hurt the relationship. While filming The Dukes of Hazzard, there were wide-spread rumors that he was having an affair with co-star Jessica Simpson, although both parties have denied it.

According to one source, the blame should be put all on Knoxville. “How do you live knowing that your husband leads a separate life… and is sleeping with other women all the time? She deserves every penny if she is going to divorce him,” the source said.

As for if they will get divorced, an insider says, “I really don’t know. They have been separated for a while. They just grew apart.”

The couple has one daughter, Madison, 10.