They grow up so fast!

Julia Roberts shared a rare photo Tuesday of her twins Hazel and Phinnaeus in celebration of their 19th birthday.

In the black-and-white throwback Polaroid posted to Instagram, the “Pretty Woman” star sat crossed-legged on the floor while cuddling her son and daughter with both arms.

“

✨✨19✨✨ ,” she captioned the shot. “There are no words for the joy, the fun, the wild rumpus of life together 💕.”

Roberts, 56, and her husband Danny Moder, 54, also share a third child, their son, Henry, 16.

Julia Roberts Shares Rare Photo of Her Twins as They Turn 19: 'No Words for the Joy'

Julia Roberts shared an adorable throwback photo of her twins Tuesday for their 19th birthday.

The Post has contacted reps for Roberts for comment.

The Oscar-winning actress rarely shares snippets of her personal life but penned similar Instagram tributes for the twins on their 17th and 18th birthdays.

Julia Roberts Shares Rare Photo of Her Twins as They Turn 19: 'No Words for the Joy'
Roberts shared this photo to Instagram on Tuesday.Instagram/@juliaroberts

Julia Roberts Shares Rare Photo of Her Twins as They Turn 19: 'No Words for the Joy'
Roberts is pictured with her in Essaouira, Morrocco on Oct. 29, 2006.©2006 RAMEY PHOTO 310-828-3445
She also only gushes about Moder on special occasions, like the couple’s 21st wedding anniversary in July.

“21,” she captioned yet another throwback picture at the time, along with the hashtags “#truelove,” “#heckyeah,” and “#fromhereonout.”

Roberts unexpectedly spoke about her married and family life on Gwyneth Paltrow’s Goop podcast in 2018.

Julia Roberts and her husband, cinematographer Daniel Moder, attend a reception for the 2022 Kennedy Center honorees at the White House on Dec. 4, 2022.
Julia Roberts and her husband, cinematographer Daniel Moder, attend a reception for the 2022 Kennedy Center honorees at the White House on Dec. 4, 2022.Getty Images
“It just gets deeper, it just gets more complex,” she said of the evolution on marriage. “You’re young and you fall in love and go, ‘Oh, yeah, we’re going to get married and we’re going to build a house and will have kids,’ and all these things that we all kind of dream of, but you don’t know if you’re going to like the same couch, and you don’t know if he is going to want to get, like, patterned towels.”

She continued, “Then, of course, the bigger ones are, will you parent in a way that has balance to it, that holds hands in philosophy? You just don’t know these things until you are right there doing it, and we are so fortunate that there is some kind of inexplicable harmony to the way we do things, because we do things differently …. but there’s something together that makes all the sense in the world.”