Credit: Courtesy of Justin Timberlake

Mama's boy! Justin Timberlake made his affection for his mother Lynn Harless known on Tuesday, Jan. 20.

The Grammy winner, 33, took to Instagram to celebrate his mom's 54th birthday. He shared an adorable throwback photo of himself as a young boy, standing in swim trunks on the beach with Harless, as she reclined on a beach towel. 

"Happy Bday to my first partner in crime and the FIRST QUEEN OF THE HOUSE," Timberlake captioned the sweet shot. "We have been through so much together and I love you more than words can begin to describe. Everything I am and continue to strive to be is because of you. I love you, Momma! #UandMeVsAnybody"

Timberlake has been known to keep his mother by his side, bringing Harless as his date to big events like the Academy Awards in 2011, the MTV VMAs in 2013, and Hollywood parties where she rubbed shoulders with the likes of Ellen DeGeneres, Jamie Foxx, and, of course, Timberlake's wife Jessica Biel

Timberlake opened up about his mother in a 2003 interview with Rolling Stone, right when he struck out on his own after his 'N Sync days. 

"We have a very special relationship," he told the mag at the time. "She's been my best friend since I figured out who I wanted to be."

"She's great, and such a fun woman," Timberlake added of Harless. "She goes out with me and stays out later than I do. She's always been there beside me, and I think that's part of my problem with girls. You keep searching for somebody as good as your mother, and that's a losing battle."

The "TKO" singer famously found his person in Biel, 32, who is now pregnant with the couple's first child. After marrying the actress in 2012, Timberlake will become a parent in his own right when Biel gives birth in the coming months.