Tristan Thompson ‘s third baby mama Maralee Nichols celebrated their son Theo’s second birthday with a party Monday.

The sizzling 32-year-old NBA love rat conceived Theo with Maralee back when he was still dating his on-off girlfriend Khloe Kardashian.

By the time it emerged that Maralee had given birth to Tristan’s baby, he and Khloe already had a surrogate pregnant with their own son Tatum.

Putting aside the family drama, Maralee uploaded a few festive snaps to her Insta Stories showing her little boy’s second birthday party.

Evidently the festivities had a train theme, based on the balloon letters on the wall reading: ‘CHUGGA CHUGGA TWO TWO.’

Tristan Thompson ‘s third baby mama Maralee Nichols celebrated their son Theo’s second birthday with a party Monday

A small train track had even been set up for the fete, where little Theo could be glimpsed playing with a building block that had his name stamped on it

A small train track had even been set up for the fete, where little Theo could be glimpsed playing with a building block that had his name stamped on it.

Tristan was absent from Maralee’s Insta Stories from the party, leaving the question open as to whether he was in attendance.

Two months ago Kai Cyre, whose sister Jordan Craig is the mother of Tristan’s firstborn son Prince, accused him of being an absentee father.

‘Tristan has not paid the child support in a very long time and has stopped paying Prince’s school tuition,’ Kai claimed on Instagram, adding an allegation that he ‘hasn’t even inquired where Prince goes to school now.’

Khloe and Tristan’s five-year on-off relationship ended for the last time in 2021, and that December DailyMail.com exclusively revealed the NBA star had fathered a child with Maralee while he was still involved with Khloe.

He and Khloe dated sporadically between 2016 and 2021, despite the relationship being buffeted by the sportsman’s repeated cheating scandals.

Along with baby Tatum, the pair share a five-year-old daughter called True whom they welcomed into the world in April 2018.

Less than 48 hours before True was born, DailyMail.com exclusively broke news of Tristan’s alleged fling with New York City strip club bartender Lani Blair.

Tristan Thompson ex Maralee Nichols takes son Theo to a farm

The sizzling 32-year-old NBA love rat conceived Theo with Maralee back when he was still dating his on-off girlfriend Khloe Kardashian; Maralee is pictured with Theo

By the time it emerged that Maralee had given birth to Tristan’s baby, he and Khloe already had a surrogate pregnant with their own son Tatum

He and Khloe remained together then, but broke up in 2019 after Tristan shared a kiss at a party with Kylie Jenner’s then best friend Jordyn Woods.

When the coronavirus lockdowns struck, Tristan and Khloe moved in together so they could both be with True – and wound up rekindling their romance as well.

Reports of their latest split began circulating in June 2021 as Tristan found himself denying a swirl of rumors about his fidelity.

Then DailyMail.com exclusively obtained court documents in late 2021 claiming Tristan was having a baby by Maralee.

Maralee gave birth on December 1 and released a statement a couple of weeks later along with the first public pictures of her son.

Tristan fired up his Instagram in January 2022 and confessed for the first time that he was the father of Maralee’s baby, having established the fact via a paternity test.

Khloe unleashed a furious tirade against her ex in the season one finale of The Kardashians, which aired last June, after learning about Tristan and Maralee’s baby.

She made the shock discovery about Tristan when her sister Kim Kardashian, 41, read a story on DailyMail.com, which exclusively revealed the news that the former NBA player had admitted to fathering a child in court papers.

Khloe is pictured with her and Tristan’s little bundles of joy – True, five, and Tatum, 15 months – celebrating Halloween a couple of months ago

Less than 48 hours before True was born, DailyMail.com exclusively broke news of Tristan’s alleged fling with New York City strip club bartender Lani Blair (pictured)

They remained together then, but broke up in February 2019 after Tristan shared a kiss at a party with Khloe’s sister Kylie Jenner’s then best friend Jordyn Woods (pictured)

An emotional Khloe was seen breaking down in tears as she slammed Tristan for ‘humiliating’ her with another public scandal.

‘I called him and was just like, what have you got to say? It was more yelling on my end, but him talking, trying to plead his case. There’s not much to talk about in my opinion,’ Khloe said later in the episode.

‘It’s a joke, it’s gross, it’s a joke, it’s embarrassing, it’s disgusting, we’re all over it. I’m like, I didn’t buy tickets to this f***ing circus but somehow I’m watching all these clowns act out in front of me,’ she added.

‘I want a refund, return to sender, I don’t want to be at this show. Somehow the clowns keep coming back in this f***ing clown car and no matter what he says nothing’s going to give me the answers that I’m looking for, the closure.’

Khloe first became involved with Tristan when his ex-girlfriend Jordan Craig was still pregnant with his eldest son Prince, six.

Although Jordan claimed she was still with Tristan when he took up with Khloe, the reality star has insisted she thought he was single at the time.

Maralee Nichols enjoys a fun day at the zoo with her son Theo