Jennifer Aniston’s ex-husband Justin Theroux showed there were no hard feelings as he wished her a happy 50th birthday.

The Friends actress celebrated the milestone on Monday.

Theroux posted a black and white image of her on Instagram, writing: “Happy Birthday to this fierce Woman.

“Fiercely loving. Fiercely kind. … and fiercely funny. (Love) you B.”

The couple announced their separation in February last year after less than three years of marriage.

Aniston marked the milestone at the weekend with a huge party attended by the likes of Courteney Cox, Gwyneth Paltrow, George Clooney, Katy Perry and Kate Hudson.

Several stars shared snaps from the bash as they wished Aniston a happy birthday on Monday.

Reese Witherspoon, who had a cameo role in Friends as the sister of Aniston’s character Rachel, shared a picture of the pair on Twitter and wrote: “What a joy to work with this talented lady every day!

“She is gorgeous, hysterical and lights up the whole world with her sunshine.

“Happy Birthday, Jen!

“Also how does your hair look that good every day?? Seriously.”

Paltrow shared images on Instagram, saying the actress made 50 look “hot”.

“Happy birthday (last night and tomorrow) to #jenniferaniston our ray of sunshine, example of perpetual goodness,” she said.

She added that the actress made “50 LOOK (fire emoji)”.

Hudson posted images of herself with Aniston and Paltrow, writing: “Love these ladies Celebrated this beauty last night Happy Bday JA!

“We all love you sooo!”