Nikki Nelson / WENN 1 / 16
Nikki Nelson / WENN 1 / 16

Us Weekly

Fifteen days after announcing his split with Jennie Garth, "Twilight" actor Peter Facinelli filed for divorce in Los Angeles County Superior Court on Wednesday, TMZ reports.

Citing "irreconcilable differences" as the cause of their breakup, Facinelli, 38, asked for joint physical and legal custody of daughters Luca, 14, Lola, 9, and Fiona, 5.

PHOTOS: 'Beverly Hills, 90210' stars then and now

According to court documents, the couple, who met on the set of "An Unfinished Affair" in 1996, officially separated on Jan. 1, 2012. Sources recently told Us Weekly the two had been living apart for some time. "It's been over for months, maybe even a year," one insider said of the couple. "They kept up some sort of charade for their kids."

PHOTOS: Love lives of 'Twilight' stars

Said another friend, "They've been working on the marriage for a while. It was not something they took lightly."

PHOTOS: Biggest celebrity breakups

When the couple announced their split, they released a statement to Us vowing to remain amicable for the sake of their children: "We both share the same deep love and devotion to our children. We remain dedicated to raising our beautiful daughters together."

"Beverly Hills, 90210" alumna Garth, 39, stars in a new CMT reality show, "Jennie Garth: A Little Bit Country," which premieres April 20.

RELATED ON WONDERWALL & MSN:

Shocking celeb splits

Photos of Peter and Jennie from happier times

Celebs who have modeled