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Ryan Phillipe, Paulina Slagter

Steve Granitz/WireImage

Ryan Phillippe and his fiancée Paulina Slagter have called it quits.

Two sources confirm to E! News that the couple, who announced their engagement in December, have broken up after five years together. The reason behind their split has not been disclosed.

The pair haven't been seen out together since mid-September in New York City, and Phillippe has been spotted at various events recently, including a Halloween party and Drake's party, without Slagter, hinting that the duo may have decided to part ways a bit ago.

Proposal details always remained a secret, but a source told us at the time that Phillippe "proposed on Christmas day."

The insider added, "They arrived in Miami on Sunday and had lunch at Seaspice, where they ate facing the river at the owner's table. She was really cute and humble about the way she showed off the ring."

"She's awesome. When people see her they have these judgments because she could be a model but she's about to graduate Stanford Law," Phillippe told Howard Stern back in April 2015 of his Stanford Law fiancée.

"Also what's great about it—as you get older certain issues become more important to you. I'm very involved in civil rights issues, and so to be with a woman who could actually make an impact in the legal realm—that's a beautiful thing."

Phillippe was last famously married to Reese Witherspoon. The former flames have 17-year-old daughter, Ava, and 13-year-old son, Deacon, together. In 2007, the celeb couple's divorce was finalized after eight years of marriage. 

He also has a 5-year-old daughter, Kailani, with model-actress Alexis Knapp.

Us Weekly first reported news of the split.