'Thrilled': Khloe Kardashian welcomes a baby boy with her ex Tristan Thompson

Khloe Kardashian is "thrilled to extend her family" after welcoming a son.

The 38-year-old reality TV star and her 31-year-old basketball player ex Tristan Thompson - who already have daughter True, four, together - have added to their family with a baby boy born via surrogate and Khloe is over the moon.

A source told Us Weekly: "Both baby and mother are very happy and healthy. Khloe is so thrilled to expand her family."

The new baby was conceived in November, before Khloe discovered that Tristan was having a baby with Marlee Nichols in December.

Tristan - who also has five-year-old Prince with ex Jordan Craig - and Khloe have not spoken since, except to discuss co-parenting True.

A source previously told PEOPLE: "Khloe and Tristan are not back together and have not spoken since December outside of co-parenting matters.

"The baby was conceived via surrogate before it was revealed to Khloe and the public that Tristan was having a baby with someone else in December."

And one of Khloe's close friends, Faye Resnick, recently branded Tristan "disappointing".

She told E! News: "I love everything about Khloe and True. Obviously, Tristan was a little disappointing but, aunties and moms and sisters, Khloe and True, it's a beautiful family and we're all just right there. It's a village.

"She is so excited. She is really excited; she's having a baby! True has a little sibling. It's such a good time."

Photo / Instagram @khloekardashian

Khloe and Tristan started dating in 2016 and welcomed True together in 2018.

They split in June 2021 before later reuniting and ended their relationship again in January.

The news of the surrogacy was announced last month, with a rep saying: "We can confirm True will have a sibling who was conceived in November.

"Khloé is incredibly grateful to the extraordinary surrogate for such a beautiful blessing. We'd like to ask for kindness and privacy so that Khloe can focus on her family."

Tristan also has son Prince, five, with his ex Jordan Craig and son Theo, eight months, with Maralee Nichols.

Khloe previously revealed she suffered complications during her pregnancy with True and was warned by doctors about the dangers to a baby if she conceived again.

She said: "I'm not gonna get into specifics on-camera, but they said it's like an 80-something per cent chance that I will miscarry. I almost miscarried with True at the beginning. But I didn't know that was like a lingering thing.

"This is all really shocking to me. All I'm trying to do is bring more love into my life and into my family, and I just seem to be running into more and more roadblocks. It's really hard for me to digest."

- Bang! Showbiz