Kim Kardashian was known for having a frosty relationship with her sister Khloe's boyfriend Tristan Thompson when it was rumoured he had cheated on her just days before she gave birth to their daughter.

But it seems Kim and Tristan have finally put their bitter feud to bed, as she has sent him a sweet message after he had some big career news this week.

She took to her Instagram stories on Sunday night to congratulate the basketball player on his new two-year $19million (£14million) deal with the Boston Celtics.

The mum-of-four, 40, shared a picture of Tristan, 29, in his Celtics kit while on the basketball pitch.

Kim Kardashian and Tristan Thompson are friends again (
Image:
E!)

Kim said: "Congrats @realtristan13. Boston here we come!!!!"

She finished the post with shamrock, basketball and champagne emojis.

It comes after the pair patched up their famously rocky relationship.

She congratulated him on his career news (
Image:
robkardashianofficial/Instagram)

Both she and Tristan were in the delivery room with Khloe when she gave birth to True, now two, just days after he was accused of cheating on the then mum-to-be.

In scenes shown on Keeping Up with the Kardashians, Kim poked her tongue out at Tristan and crossed her finger over her neck multiple times while they were in the hospital.

She told the camera: "The vibe in the room is calm. I thought there would be way more tension .

Tristan was rumoured to have cheated on Khloe just days before she gave birth to their daughter True
Khloe appears to have forgiven Tristan and taken him back (
Image:
E! Network)

"As much as I want to go off, I just don't think it's the time, so I'm going to keep it cute.

"I don't have to have a lot of interaction, I just have to be there for her."

Tristan has been accused of cheating on Khloe multiple times since then, but they are now back together.