Jennifer Sarah Marin Rivell (born June 5, 1973 in Florence, Alabama, United States) is an actress and former frequent guest on MTV's Viva La Bam and former member of the CKY Crew. Rivell played Glauren in Bam Margera's film Haggard: The Movie in 2003 and also played the role of Crystal in the film Misdirected in 2004.

Jenn Rivell first met Bam Margera in 1988 at the age of 15 at a skate park while Bam was 9, and entered into a relationship with him 8 years later. Rivell accepted Bam's marriage proposal when she turned 30 on June 5, 2003. However, Rivell and Margera split in April of 2005 after 7 years. Before the relationship with Bam, Rivell was married to Nate Mathesson. They had one child together. Her daughter, Gabrielle "Elle" Mathesson, was born on September 20, 1995.

Post-Margera Allegations
On the May 22, 2006 episode of Radio Bam, Bam Margera's weekly radio program on Sirius Satellite Radio, it was alleged that Bam and Jennifer's breakup was very tumultuous, especially in the period immediately after. Bam accuses Jenn of charging purchases to his credit cards, trying to sell Bam's personal effects (such as Bam's Blockbuster Video card and a tell-all lunch about Margera with herself on eBay), and crashing the Audi S4 he gave her.  Bam had given the S4 to Rivell and transferred title to her. Margera alleged that Rivell totalled the car while driving drunk with her boyfriend and fled the scene of the accident. She then allegedly transferred the title back to him, put Bam's old license plate on the car, and told the police it was Bam's in order to place the blame on him. Bam's uncle, Don Vito, also alleged that Jenn was receiving disability payments due to an addiction to cocaine. The July 31, 2006 episode of Radio Bam revealed more information on the break-up between Bam and Jenn. Bam said that Jenn had trashed his video editing room and equipment reacting to media reports of an alleged Margera affair with Jessica Simpson (allegations which Margera originally firmly denied, but later seemed to confirm with Us Weekly and Howard Stern), and that was the last straw that made him break up with Jenn. Bam claimed to have been considering breaking up with Jenn before and had also had an affair with his now wife Missy while still dating Jenn.

On November 3, 2006 Margera filed for a Protection From Abuse (PFA) against Rivell claiming that on October 17, 2006 Rivell climbed the fence to his property, entered his residence through a backdoor and kicked in a bedroom door. The motion was denied but Rivell and Margera settled out of court and Rivell agreed to sign to an order prohibiting her from Margera's residence. On the January 30, 2007 Howard Stern Show, Margera told Howard Stern that he and Rivell had previously gotten into fistfights, with one ending in Rivell pushing Margera off a second story balcony and throwing a glass at him instead of trying to help. Margera claims the police were called and threatened him with arrest though he had taken the brunt of the blows.