LOS ANGELES (AFP)- NFL star Tom Brady and Brazilian supermodel Gisele Bundchen announced Friday they were divorcing after 13 years of marriage.

Brady and Bundchen posted similar statements on Instagram, saying they had reached an amicable agreement over the terms of their split.

"In recent days my wife and I finalized our divorce from one another after 13 years of marriage," seven-time Super Bowl champion Brady wrote.

"We arrived at this decision amicably and with gratitude for the time we spent together," Brady added, describing the decision to proceed with the divorce as "painful and difficult."

"We wish only the best for each other as we pursue whatever new chapters in our lives that are yet to be written," he said, making an appeal for privacy.

The wording was echoed by Bundchen, who said in her post, "The decision to end a marriage is never easy but we have grown apart."

Both emphasized they would continue to co-parent their children and prioritize their wellbeing.

Entertainment news website TMZ.com had broken the news of the split early Friday, adding that Bundchen formally filed for divorce in Florida.

Brady and Bundchen, who married in 2009, have two children together, Benjamin, 12, and daughter Vivian Lake, nine. Brady also has a 15-year-old son, John Edward, with ex-girlfriend Bridget Moynahan.

The couple have a reported net worth of around $650 million, with Bundchen estimated to have contributed $400 million of the fortune.

The divorce comes after months of tabloid speculation concerning the couple's marriage, which reportedly came under strain when Brady reversed a decision to retire from American football.

Brady and Bundchen have been one of the most prominent celebrity power couples on the US pop culture scene, straddling sport, fashion and entertainment.

- Retirement tensions -
The 45-year-old Brady is a leading athlete in the United States, with a stellar grid-iron career that has spanned more than two decades.

Bundchen, 42, is one of the world's most recognizable models and has been the face of countless campaigns for luxury labels such as Versace, Dolce & Gabbana and Ralph Lauren.

The quarterback had announced his retirement from the NFL in February only to "unretire" the following month.

Bundchen, who over the years has repeatedly voiced concern for Brady's long-term health by his continued presence in the sport, is reported to have moved out of the family home during the pre-season.

Brady took a mysterious extended 10-day leave from the Tampa Bay Buccaneers training camp in early August, a move which was never properly explained by the player or his team.

The former New England Patriots quarterback later hinted at problems in his personal life.

"You just have to try and figure out life the best you can," Brady said at the time. "It's a continuous process."

In a September interview with Elle magazine, Bundchen once again reiterated her misgivings about her husband's decision to carry on playing -- but said she wanted him to "follow his joy."

"Obviously, I have my concerns -- this is a very violent sport, and I have my children and I would like him to be more present," she told Elle.

"I have definitely had those conversations with him over and over again. But ultimately, I feel that everybody has to make a decision that works for (them). He needs to follow his joy, too."

Brady for his part admitted on his "Let's Go!" podcast in September that juggling personal commitments with his NFL career was an ongoing struggle.

"You wrestle with different things as you get older and I'd say the only thing that changes over time is you have different priorities when you get older," Brady said.