The daughter of Reese Witherspoon with her ex-husband Ryan Phillippe just celebrated her 18th birthday and the former couple both shared sweet tribute for their daughter. Ava Phillippe just turned 18 and even if her parents are no longer together, that doesn't mean that they do not have anything to show for it.

According to E! News, Ava is often referred to Reese's twin due to their similarity which is undoubtedly uncanny. The young lady is all grown up now and just turned 18 last Saturday and both Reese and Ryan took to Instagram their sweet happy birthday messages to their only daughter.

Aside from the proud parents, the teen also shared a post on her Instagram account in the course of her birthday celebration. Reese and Ryan posted a number of throwback photos of their daughter who was then a little tow-headed angel from back in the day. However, since their daughter is already 18, the two made sure that they both honored the smart woman she has become.

Reese was married to his "Cruel Intentions" co-star Ryan from 1999 to 2007 until they decided to separate. The Oscar winner actress wrote, "Happy 18th Birthday to my sweet girl @avaphillippe! Your kindness, grace, intelligence, and humor never cease to amaze me. I love you and your HUGE {heart} and I feel so lucky that I get to be your mom. #proudmom #18."

Meanwhile, PEOPLE reported that Ryan also shared some adorable and some birthday posts which were multiple in parts. He accompanied the photos with a caption which started with a greeting then followed by how much he loves his daughter more than any stranger needs to find out.

Then Ryan followed this caption by saying that her daughter with Reese is the coolest, the smartest, and the most beautiful daughter a father could ever have. Then he concluded his tribute by sharing that even if Ava is no longer a child, he will always be his little girl then his birthday greeting. The picture which he shared appeared to be from March 3, 2002.

Moreover, apart from those, his multiple-part birthday post also showed some photos of his daughter rocking her pink hair and hanging out at the Hollywood Bowl in Los Angeles. Ava also joined her parents and posted on her Instagram account that marked her 18th birthday.