Blac Chyna treated her son King Cairo to a fun trip to a fire station on Tuesday.

The 27-year-old and her fiance Rob Kardashian, 29, took the tot to a firehouse in LA where he got to sit in a fire engine, shoot water from a hose and examine the fire truck's tools.

And his mom got into the groove too, being allowed to put on firefighter's gear including a helmet and boots.

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Fun day out: Blac Chyna took her son King Cairo, three, on a trip to a fire station in Los Angeles on Tuesday. The boy's father is the rapper Tyga who is currently dating Kylie Jenner

The little boy is Blac's son with her ex Tyga, who, of course, is dating Rob's half-sister Kylie Jenner, 18.

The only son from Kris Jenner's marriage to the late Robert Kardashian and the model have been nearly inseparable since they began dating earlier this year.

They announced their engagement a week ago after Rob presented Blac with a $325,000 ring.

Blended family: The model and her kid were joined by Rob Kardashian, to whom she is now engaged. They posed with station personnel for a photo Blac posted on social media

He's the chief! The lucky tot got to sit in the driver's seat of a fire engine

Here's how you do it: The little boy also got to shoot water from a fire hose, with a little help from a friendly firefighter

Special treat: King Cairo got to check out all the firefighter's gear close up including a fire axe

Where's the fire? Blac joined in the fun and was actually allowed to suit up in full firefighter uniform

She's equipped! The model really got into the spirit of things and posed, laughing and with her tongue out, as she carried firefighting equipment

Blac and King Cairo's visit with LA firefighters was documented on cell phone video and posted on Snapchat.

Before they headed out, though, Blac had shared a sweet clip of her son with his toy fire engine and spoke about how 'infatuated' he is with fire trucks.

Wannabe firefighter: Before they headed out, Blac shared a video on Snapchat showing her son with his toy fire truck

Couldn't wait: In the clip, King Cairo got really excited when told he was going to a fire station

Cutie pie: The three-year-old was adorable with his baby dreadlocks and his colorful t-shirt

Checked it out: He was allowed to explore all sorts of things relating to the fire truck

A good day: The doting mom clearly had as much fun as her youngster

Meanwhile, it's being reported that Rob, who famously quit his family's reality show and spent two years shying away from the spotlight, is set to return to the limelight with his new fiancee.

According to TMZ Monday, the younger brother of Kourtney, Kim and Khloe is being offered a big money deal to air his wedding with Blac in a TV special.

The website claimed the couple are considering starring in their own reality series which would see them paid between '$150-$200 thousand' each per episode, as well as '$500 thousand' each for the wedding day episode.