Kevin Federline is ready to take Britney Spears to court over child support increase, source says (Exclusive)

Britney Spears’ Las Vegas residency and worldwide tour, Britney: Piece of Me, has been a huge success for the singer, and now her ex-husband, Kevin Federline, is hoping to see some of that success reflected in larger child support payments.

A source close to Federline -- who has had full custody of the couple’s two sons, Sean Preston and Jayden James, since 2008 -- tells ET that he wants an increase in child support and is willing to take the pop star to court to get it. “Kevin wants to ask them to consider paying an amount of child support that would be appropriate given the significant increase in her finances,” the source says.

Spears kicked off her Vegas residency at the Axis at Planet Hollywood on Dec. 27, 2013, and performed her final show on Dec. 31, 2017, with a worldwide tour of the same name scheduled to continue this year. Billboard reported that the residency alone grossed $137.7 million, with nearly 1 million seats sold.

See photos of Britney and K-Fed together:

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Britney Spears and Kevin Federline together
AMSTERDAM, NETHERLANDS - MAY 6: (UK, US AND CANADA RIGHTS ONLY) Pop superstar Britney Spears and new boyfriend Kevin Federline spend time together in Amsterdam on May 6, 2004 in The Netherlands. Federline is a dancer and the pair have apparently been friends for a while ahead of becoming a couple. (Photo by Dennis van Tellingen/Bruno Press/Getty Images)
Kevin Federline and Britney Spears at the MGM Grand Garden in Las Vegas, Nevada (Photo by Kevin Mazur/WireImage)
LAS VEGAS - DECEMBER 8: Singer Britney Spears and husband Kevin Federline kiss as they arrive at the 2004 Billboard Music Awards on December 8, 2004 at the MGM Grand Garden Arena, in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images)
Britney Spears and Kevin Federline during 2004 Billboard Music Awards - Red Carpet at MGM Grand Garden in Las Vegas, Nevada, United States. (Photo by KMazur/WireImage)
Britney Spears and Kevin Federline (Photo by Mel Bouzad/FilmMagic)
Britney Spears and Kevin Federline at the Chinese Theatre in Hollywood, California (Photo by Jeffrey Mayer/WireImage)
(EXCLUSIVE, Premium Rates Apply) Britney Spears and Kevin Federline (Photo by James Devaney/WireImage)
Britney Spears and Kevin Federline (Photo by Kevin Mazur/WireImage for People Magazine)
Kevin Federline and Britney Spears with guests during 12th Annual Screen Actors Guild Awards Official After Party hosted by People Magazine and the Entertainment Industry Foundation at Shrine Auditorium in Los Angeles, California, United States. (Photo by
Kevin Federline and Britney Spears during Rolling Stone/Verizon Wireless Pre-GRAMMY Concert with Kanye West - Arrivals at Spider at Avalon in Los Angeles, California, United States. (Photo by Jason Merritt/FilmMagic)
Kevin Federline and Britney Spears during Rolling Stone/Verizon Wireless Pre-GRAMMY Concert with Kanye West - Arrivals at Spider at Avalon in Los Angeles, California, United States. (Photo by Jason Merritt/FilmMagic)
HOLLYWOOD - FEBRUARY 08: Singer Britney Spears (R) and husband Kevin Federline arrive at the SONY BMG Grammy Party held at The Hollywood Roosevelt Hotel on February 8, 2006 in Hollywood, California. (Photo by Vince Bucci/Getty Images)
Kevin Federline and Britney Spears (Photo by Larry Busacca/WireImage for Sony BMG Music Entertainment)
Kevin Federline, Britney Spears and Tyra Banks (Photo by George Pimentel/WireImage for Ogilvy Public Relations)
Kevin Federline and Britney Spears during Belated Birthday Party for Kevin Federline with Britney Spears Hosted by Scooter Braun - Arrivals at Vision Nightclub & Lounge in Atlanta, Georgia, United States. (Photo by Ben Rose/WireImage)
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Given her recent financial success, the source says, Federline feels like he deserves more in child support payments, noting that the dancer and reality star currently receives around $20,000 a month from his ex-wife. “Kevin could have done this years ago, but he didn’t. If he had, he would have been receiving two or three times the amount of child support that he has been receiving,” the source explains.

The source adds that Federline hoped to amicably work out new child support payments with Spears, but they haven’t been able to come to an agreement, noting that the matter could go to court “soon.” “[Kevin] was disappointed that they couldn’t sit down and resolve this amicably.”

The source insists that relationship between the exes -- who married in 2004 and finalized their divorce in 2007, after welcoming Sean and Jayden in 2005 and 2006, respectively -- is “cordial,” explaining that Federline’s request for increased payments stems from a desire to provide for his sons.

“They come from a place where they will buy everything the boys will need,” the source says, referring to Spears, who has been dating model Sam Asghari since 2017. “Kevin wants to get the appropriate child support so that he too can pay for those things.”

“Kevin has gone beyond what’s reasonable to make sure [Britney] has full access to the boys,” the source adds. “He has full custody but he shares the time with her. Kevin has always allowed her to have more time with the boys.”

ET has reached out to Federline’s lawyer, Mark Vincent Kaplan, as well as reps for Spears for comment.

See more photos of Britney Spears:

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Britney Spears poses during a portrait session on October 2, 1998 in Los Angeles, California.
Singer Britney Spears attends Z100's Fifth Annual 'Jingle Ball' Concert on December 17, 1998 at Madison Square Garden in New York City. (Photo by Ron Galella, Ltd./WireImage)
Singer Britney Spears visits 'The Late Show with David Letterman' on May 25, 1999 at the Ed Sullivan Theatre in New York City. (Photo by Ron Galella, Ltd./WireImage)
(EXCLUSIVE COVERAGE � PREMIUM RATES APPLY) Britney Spears poses during a portrait session on May 1, 1999 in Los Angeles, California.
Britney Spears (Photo by Steve Granitz/WireImage)
UNITED STATES - SEPTEMBER 28: Britney Spears is on hand for screening of the movie 'Drive Me Crazy' at the Union Square Theater. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)
Britney Spears (Photo by Steve Granitz/WireImage)
Britney Spears (Photo by Steve Granitz/WireImage)
Singer Britney Spears attends the 42nd Annual Grammy Awards Pre-Party Hosted by Clive Davis on February 22, 2000 at Beverly Hills Hotel in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
NEW YORK - SEPTEMBER 7: American pop star Britney Spears attends the MTV Music Video Awards held at Radio City Music Hall on September 7, 2000 in New York. (Photo by Dave Hogan/Getty Images)
LONDON - APRIL 20: American pop singer Britney Spears at the Capital Radio awards in the Royal Lancaster Hotel, London on April 20, 2000. Spears won the title of London's Favourite International Female. (Photo by Dave Hogan/Getty Images)
Britney Spears In Paris, France - 2000, Britney Spears In Front Of The Eifel Tower (Photo by Brian Rasic/Getty Images)
Britney Spears (Photo by Jeff Kravitz/FilmMagic)
Singer Britney Spears watches the celebrity basketball game at 'N Sync's 'Challenge for the Children III' charity event at the Thomas & Mack Center July 29, 2001 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
Britney Spears (Photo by SGranitz/WireImage)
Singer Britney Spears attends the 'Crossroads' Hollywood Premiere on February 11, 2002 at Grauman's Chinese Theatre in Hollywood, California. (Photo by Ron Galella, Ltd./WireImage)
Britney Spears arrives at Planet Hollywood to give fans a Sneak Peek at her new photo book 'Stages', to be released with a co-pack DVD, in New York City. December 6, 2002. Photo by Evan Agostini/Getty Images.
Britney Spears during 2002 MTV Video Music Awards - Arrivals at Radio City Music Hall in New York City, New York, United States. (Photo by Jeff Kravitz/FilmMagic)
NEW YORK - NOVEMBER 18: Singer Britney Spears appears on stage during 'Spanking New Music Week' on MTV Total Request Live at the MTV Times Square Studios November 18, 2003 in New York City. (Photo by Mark Mainz/Getty Images)
Britney Spears (Photo by Dimitrios Kambouris/WireImage)
Britney Spears, winner of Hot Dance Sales Single of the Year for 'Me Against the Music' (Photo by J. Merritt/FilmMagic)
LONDON - APRIL 26: (UK NEWSPAPERS OUT) Pop star Britney Spears plays first night of her 'UK Onyx Hotel Tour 2004' at Wembley Arena on April 26, 2004 in London. The tour is her first UK tour since 2000, and features her greatest hits alongside tracks from current album In The Zone. (Photo by Getty Images)
Britney Spears promotes the new Pepsi ad at the National Gallery. (Photo by rune hellestad/Corbis via Getty Images)
(EXCLUSIVE, Premium Rates Apply) Britney Spears celebrated the global launch of her fragrance 'curious' from Elizabeth Arden. (Photo by Larry Busacca/WireImage for Elizabeth Arden)
Britney Spears during Britney Spears Sighting In New York City - November 7, 2006 at Rockafeller Center in New York City, New York, United States. (Photo by James Devaney/WireImage)
(EXCLUSIVE, Premium Rates Apply) Britney Spears at Pink by Victoria?s Secret *EXCLUSIVE* (Photo by Alexandra Wyman/WireImage for Primary Action)
(EXCLUSIVE, Premium Rates Apply) Britney Spears **EXCLUSIVE** (Photo by Kevin Mazur/WireImage)
LOS ANGELES, CA - DECEMBER 01: Singer Britney Spears attends the Scandinavian Mansion of Style held on December 1, 2007 in Los Angeles, California. (Photo by Mark Sullivan/WireImage)
TO GO WITH AFP YEARENDER GERMANY FILES - Performer Britney Spears looks out the window of her car as she awaits a decision by sheriff's deputies as to where she should park, 26 October 2007 outside Family Court in Los Angeles, California, where she was due for a hearing regarding the custody of her children. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
LAS VEGAS - SEPTEMBER 09: Singer Britney Spears performs during the 2007 MTV Video Music Awards at The Palms Hotel and Casino on September 9, 2007 in Las Vegas, Nevada. (Photo by John Shearer/WireImage)
Britney Spears (Photo by Todd Williamson/FilmMagic)
Britney Spears accepts the award for Best Pop Video for "Piece of Me" at the 2008 MTV Video Music Awards in Los Angeles September 7, 2008. REUTERS/Mario Anzuoni (UNITED STATES)
Britney Spears arrives at the Teen Choice 2009 Awards taping in Los Angeles, California August 9, 2009. REUTERS/Fred Prouser (UNITED STATES ENTERTAINMENT)
NEILL J SCHUTZER/�2010 RAMEY PHOTO Los Angeles, California, November 28, 2010 Britney Spears arrives at LAX with her bodyguards and her sons, back from Thanksgiving with her family back east. NJS (Photo by Philip Ramey/Corbis via Getty Images)
LOS ANGELES, CA - JANUARY 31: Singer Britney Spears arrives at the 52nd Annual GRAMMY Awards held at Staples Center on January 31, 2010 in Los Angeles, California. (Photo by Christopher Polk/Getty Images)
Singer Britney Spears smiles on stage at the 2011 Wango Tango concert in Los Angeles May 14, 2011. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
LOS ANGELES, CA - AUGUST 28: Britney Spears attends the 2011 MTV Video Music Awards at the Nokia Theatre LA. Live on August 28, 2011 in Los Angeles, CA. (Photo by Anthony Harvey/Getty Images)
Britney Spears attends 102.7 KIIS FM's Wango Tango concert at Staples Center on May 14, 2011 in Los Angeles, California.
LOS ANGELES, CA - DECEMBER 19: Singer/Judge Britney Spears arrives at Fox's 'The X Factor' Season Finale Night 1 at CBS Television City at CBS Studios on December 19, 2012 in Los Angeles, California. (Photo by Jeffrey Mayer/WireImage)
Singer Britney Spears poses at the premiere of "The Smurfs 2" at the Regency Village theatre in Los Angeles, California July 28, 2013. The movie opens in the U.S. on July 31. Speaks performed the song "Ooh La La" from the movie. REUTERS/Mario Anzuoni (UNITED STATES - Tags: ENTERTAINMENT)
LAS VEGAS, NV - SEPTEMBER 21: Entertainer Britney Spears attends the iHeartRadio Music Festival at the MGM Grand Garden Arena on September 21, 2013 in Las Vegas, Nevada. (Photo by Jason Kempin/Getty Images for Clear Channel)
Pop star Britney Spears arrives at the 2014 Elton John AIDS Foundation Oscar Party in West Hollywood, California March 2, 2014. REUTERS/Gus Ruelas (UNITED STATES TAGS: ENTERTAINMENT) (OSCARS-PARTIES)
Singer Britney Spears waves during the launch of her lingerie collection 'The Intimate Britney Spears Spring/Summer 2015', at a shopping mall in Oberhausen September 25, 2014. REUTERS/Ina Fassbender (GERMANY - Tags: FASHION ENTERTAINMENT)
LAS VEGAS, NV - NOVEMBER 21: Singer Britney Spears arrives at a Christmas tree-lighting ceremony at The LINQ Promenade on November 21, 2015 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)
LOS ANGELES, CA - AUGUST 30: Singer Britney Spears arrives at the 2015 MTV Video Music Awards at Microsoft Theater on August 30, 2015 in Los Angeles, California. (Photo by Gregg DeGuire/WireImage)
Singer Britney Spears poses backstage with her Choice Style Icon award at the 2015 Teen Choice Awards in Los Angeles, California, United States August 16, 2015. REUTERS/Danny Moloshok
Singer Britney Spears arrives at the 2016 MTV Video Music Awards in New York, U.S., August 28, 2016. REUTERS/Eduardo Munoz
LOS ANGELES , CA - DECEMBER 02: Britney Spears performs on stage during the 102.7 KIIS FM's Jingle Ball 2016 on December 02, 2016 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
BEVERLY HILLS, CA - FEBRUARY 11: Singer Britney Spears attends the 2017 Pre-GRAMMY Gala And Salute to Industry Icons Honoring Debra Lee at The Beverly Hilton Hotel on February 11, 2017 in Beverly Hills, California. (Photo by Jeff Kravitz/FilmMagic)
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