Christina Anstead has gender reveal party after ex Tarek El Moussa let slip ...

Her ex husband Tarek El Moussa accidentally revealed she was having a boy earlier this week.

But that didn't stop Christina El Moussa from having a gender reveal celebration this Friday.

'It's a boy!' the Flip Or Flop star, 35, officially announced with a festive photo of her blended family cheering as blue confetti rained from the sky.

It's a boy! Though her ex already let the cat out of the bag, Christina Anstead had a gender reveal celebration with her blended family on Friday

It's a boy! Though her ex already let the cat out of the bag, Christina Anstead had a gender reveal celebration with her blended family on Friday 

In the photo Christina was with husband Ant Anstead, as well as her two children and his children from his previous marriage. 

Christina talked about how excited her 'blended family' is about their new addition as she continued her caption.

'@ant_anstead, the kids and I are so excited! This blended family cannot wait to add our 5th child to the mix!'

Wheelers Dealers persona Ant joked about Tarek's slip of the tongue in his own Instagram post, writing: 'I'm the very last to the gender reveal game.... [Christina] our beautiful (and growing) blended family and I are so thrilled to be having a BOY in September.'

He told fans he was 'Welcoming any and all name suggestions' for the little boy.

Take a guess! Though Tarek had already let the secret slip, the couple played along

Take a guess! Though Tarek had already let the secret slip, the couple played along

Unfortunately for the happy couple, their secret had already been shared. 

Christina's ex husband Tarek El Moussa unceremoniously revealed the gender of during an interview with TMZ on Monday.

Prior to Tarek's comments neither Christina nor her new husband Ant Anstead had addressed the gender of their little one.

But after Tarek let the news slip, Christina shared her reaction with Us Weekly, telling the magazine: 'While Christina and Ant wished they could have shared the news themselves, they are very excited to welcome a baby boy in the fall.' 

Cat it out of the bag: Tarek El Moussa unceremoniously revealed the gender of his ex wife Christina Anstead's baby during an interview with TMZ on Monday

Cat it out of the bag: Tarek El Moussa unceremoniously revealed the gender of his ex wife Christina Anstead's baby during an interview with TMZ on Monday

The 37-year-old was asked how he gets along with his ex during a live interview and completely unprompted told the world that Christina was having a boy.

Tarek said that after their split 'it was like pulling teeth' with the 35-year-old blonde beauty but that 'things are good today.' 

'She's remarried, she's actually pregnant,' he

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