Jennifer Aniston Wishes Friends Costar Lisa Kudrow a Happy 59th Birthday: 'I Love You!'

The Emmy Award winner celebrated her 59th birthday on Saturday with help from her Friends costar Jennifer Aniston, who paid tribute to Kudrow with some fond throwbacks of the two of them.

"Happy birthday @lisakudrow," Aniston, 53, captioned a photo of them at the 29th People's Choice Awards in 2003.

"I love you," she wrote with a GIF of them jumping up and down and cheering as their Friends characters Rachel Green and Phoebe Buffay.

Aniston also shared a more recent candid photo of herself kissing Kudrow on the forehead.

Kudrow has said that her son Julian Stern, used to think Aniston was his mother. "He got a little confused, I know that he was really obsessed with Jen Aniston," she said .

She'd be on TV, and he'd go, 'Mommy! I'm kind of analytical so I'm like Is this wishful thinking? Do they have some kind of higher soul connection that I don't have?' I'm happy for both of them."

Kudrow told about cast's long-lasting bond at the time: "I feel like we can pick up right where we left off, and no time's passed. We're connected no matter what."