• Donald Trump Jr. and Fox News alum Kimberly Guilfoyle have been engaged for a year, reports said
  • Guilfoyle was spotted wearing a diamond ring on her ring finger in an Instagram photo she shared over the weekend
  • She called Trump "the love of my life" in the post

Donald Trump Jr. and Kimberly Guilfoyle are engaged, according to reports.

The couple kept the engagement hidden from public view for a year after former President Donald Trump's eldest son, 44, popped the question to the former Fox News anchor, 52, last year, an unnamed source "close to both of them" told Page Six Monday.

Trump and Guilfoyle got engaged on New Year's Eve 2020, which is his birthday, Daily Mail reported, citing unnamed sources.

Guilfoyle sparked engagement rumors Saturday when she was spotted wearing a massive diamond ring on her ring finger in an Instagram photo she shared over the weekend.

The snap showed Guilfoyle, dressed in a figure-hugging black dress, posing with Trump, who is rocking a navy blue tuxedo, in front of a Christmas tree at Mar-a-Lago in Palm Beach, Florida.

"Tonight was extra special celebrating @donaldjtrumpjr's birthday," she wrote in the caption. "Don, you are strong, smart, courageous, funny and the love of my life. I can’t wait to spend the rest of our lives together. Love you."

Trump posted his own New Year's Eve photo of the couple, along with musician Jason Aldean and wife Brittany Aldean. "Great being with these freedom-loving patriots to ring in the new year," he wrote.

Trump and Guilfoyle started dating in May 2018, according to Page Six, about two months after his then-wife Vanessa Trump filed for divorce. He and Vanessa share five children together.

Meanwhile, Guilfoyle was previously married to businessman Eric Villency, with whom she shares 15-year-old son Ronan Anthony Villency, from 2006 to 2009. She was also married to former San Francisco Mayor and current California Gov. Gavin Newsom for four years until they separated in 2005.

Trump and Guilfoyle were friends for more than a decade before they started dating. They ran in the same circles and were introduced by mutual friends. In November 2007 and June 2008, they were photographed together with their former spouses. Her son, Ronan, and his oldest daughter, Kai, went to the same private school in Manhattan.

Trump and Guilfoyle made their relationship Instagram official in June 2018. He shared a series of photos with Guilfoyle on the platform.

Trump also thanked her in a speech at the time, calling her his "significant other."

In February last year, Guilfoyle gushed over Trump during an episode of Hamptons TV show "Successful Philanthropy."

"We're very committed and very in love," Guilfoyle told Jean Shafiroff when asked if she would say yes if he popped the question. "He is my sweetheart. I already feel married and committed to him, 100%. Being his wife would be something that, of course, would be something that I think would be fantastic. I absolutely adore the family … I already feel married to him."

Trump and Guilfoyle's reps have not yet publicly commented on the engagement news.

Donald Trump Jr. and Kimberly Guilfoyle
Donald Trump Jr. and Kimberly Guilfoyle attend the Zang Toi runway show in Gallery II in Spring Studios during New York Fashion Week: The Shows at Spring Studios on February 13, 2019 in New York City. Manny Carabel/Getty Images