Source: Getty / Kevin Mazur [1]

Time to swoon, because Justin Timberlake [2] posted the sweetest of birthday messages for his mom on Tuesday. The singer took to Instagram [3] to wish his mom a happy birthday, writing, "Happy Bday to my first partner in crime and the FIRST QUEEN OF THE HOUSE. 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." Justin shared the message with the crazy-cute throwback beach picture below — proving once again that baby JT just couldn't be cuter [4]. And, of course, he grew up to be really cute, so take a look at the sexiest Justin Timberlake pictures [5], then see more of the best throwback snaps from hot Hollywood guys [6].