Kaley Cuoco just copped a public serve from her Big Bang Theory co-star and ex-boyfriend Johnny Galecki – on her birthday, no less.
Cuoco celebrated her 35th birthday this week, and Galecki, 45, marked the occasion with a tongue-in-cheek Instagram tribute to the woman who played his wife on Big Bang.
Alongside a selection of photos of the pair on red carpets and behind the scenes over the years, Galecki wrote: "The happiest 74th birthday to my fake wife @kaleycuoco. You know how much I adore you and respect you. I'm so proud of all you are doing and so happy with your happiness. But most of all, our friendship and partnership over the years. XO, dear. Congratulations on 82 years of age."
Cuoco took the cheeky jabs at her age with good humour, writing under the post: "THIS IS EVERYTHING! I LOVE U MOOKS! Even at my old age of 82!"
Galecki then took his opportunity to prematurely age Cuoco even further, writing back: "Love you too, Mooks. Thanks for squeezing the last bit of love out of that 91-year-old heart of yours for this response. Now rest, dear."
The pair started dating in 2007, the same year Big Bang Theory started. While their relationship finished two years later, they remained good friends up until the hit sitcom's finish last year and beyond.
It wasn't without some awkwardness, though: Cuoco recently claimed that Big Bang Theory bosses added more sex scenes between the pair after they split "just to f**k with us".
And since their time together on Big Bang ended, they've had to make do with the sort of sarcastic social media back-and-forth that only old friends can get away with.
When Cuoco posted a five-minute video to Instagram back in January giving fans an update on her upcoming projects, Galecki couldn't help but comment underneath: "Someday I'll make it through an entire one of these. I swear. XO."
And both have been back in the headlines recently: Cuoco, for her star turn in the racy new series The Flight Attendant, now streaming on Binge; Galecki, because he reportedly split from his girlfriend, model Alaina Meyer, after two years together.
Galecki and Meyer, 23, have son Avery together, who was born in December last year.
A source told People this week that the two have broken up and are now co-parenting. They are yet to comment.
The couple, who were regularly posting pictures of each other on Instagram, hadn't appeared in a photo together since April: