• Jennifer Aniston wished Paul Rudd on his birthday
  • The actress complimented Rudd for his ageless looks
  • Mark Ruffalo also joked about Rudd's looks

Paul Rudd turned 52 on Tuesday and his former "Friends" co-star Jennifer Aniston took to Instagram to wish him and compliment his ageless looks.

Aniston shared a series of pictures on her Instagram Story along with a sweet message, "Happy birthday #PaulRudd!! You don't age, which is weird - but we celebrate you anyway."

The actress shared another Instagram Story, which featured a still from the romantic comedy, "The Object of My Affection," which released in 1998 starring Paul Rudd as her love interest. The on-screen couple also worked in the 2012 movie, "Wanderlust."

In the next Instagram Story, the "Just Go with It" star posted a cute collage of the two. In the first collage, Rudd and Aniston are seen with a blanket pulled above their noses while the second picture showed a fun pillow fight.

Although Rudd and Aniston share great chemistry now, it wasn't the same when they first started working together. The actor opened up on the "Graham Norton Show" in 2019 and admitted that the start of their friendship was not smooth.

"I was on the set for my first episode and Jennifer was on a Segway because she had broken her toe, and everyone was marveling at it," he explained, Hello Magazine reported. "Matt LeBlanc asked to have a go and immediately knew how to do it. I then asked to try it too."

"I spun around and rolled it right over Jennifer’s foot! The producer's look of panic as if to say, ‘Is it too late to fire him? Has his character been established yet?’ I felt awful. Such an inauspicious start," he added.

Besides Aniston, Mark Ruffalo also wished Rudd on his birthday and joked about his ageless looks.

The "I Know This Much Is True" star took to Instagram on Tuesday to share Rudd's picture from behind the scenes of "The Avengers" and wrote, "Happy birthday, Paul Rudd! Did I find the secret behind your eternal youth?" he captioned.

On the work front, Rudd's upcoming movies include "Ghostbusters: Afterlife" and "Halloween Kills," which will release later this year while "Ant-Man and the Wasp: Quantumania," is slated to release next year.

Paul Rudd Ant-Man Paul Rudd compared joining Marvel's "Avengers" franchise to being part of the "Friends" cast. Photo: Marvel Studios