Aww!Sarah Michelle Gellar and Freddie Prinze Jr.’s Kids Charlotte and Rocky Look So Grown Up in Rare Photo

Sarah Michelle Gellar and Freddie Prinze Jr.'s kids are growing up so fast!

The 39-year-old actress took to Instagram on Sunday, Aug. 28 to share a rare photo of the couple's six-year-old daughter, Charlotte, and three-year-old son, Rocky — and the new pic is cuter than cute!

"Enjoying the last day together, before school starts tomorrow (well for one of them at least). #SiblingLove #BackToSchool #EndOfSummer," the Cruel Intentions star captioned the sweet snapshot of the siblings walking hand in hand.

MORE: Sarah Michelle Gellar and Freddie Prinze Jr. Just Made a Surprising Parenting Confession — Find Out Here!

Sarah and Freddie, 40, met in 1997 while costarring in I Know What You Did Last Summer and married in September 2002. The couple later welcomed Charlotte in September 2009 and Rocky in September 2012.

Click through the gallery below to see more of Hollywood’s cutest kids!