by Lynda Brendish - Entertainment Tonight

Blac Chyna and Rob Kardashian headed to the Magic Kingdom for a family day out on Sunday, and Chyna jokingly put some magic of her own on Rob -- documenting their day in a sweet set of Snapchats.

The Rob and Chyna stars hit up Disneyland with Chyna's 4-year-old son, King Cairo, along with pal, Amber Rose, and her 3-year-old son, Sebastian. The 28-year-old model snapped a super cute pic of the kids together.

Hey, what's up ūüėé @blacchyna on snapchat. #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna¬† #angelawhite

A photo posted by Roblac (@roblac_) on

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While the weather was unusually dreary for Southern California, the mood seemed cheerful -- the often camera-shy Rob even smiled for the camera, posing with Chyna in front of a Ferris wheel and with King Cairo on a Toy Story ride.

Babies @blacchyna on snapchat. @robkardashian #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A photo posted by Roblac (@roblac_) on

@blacchyna on snapchat. #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A photo posted by Roblac (@roblac_) on

The reality star is even seen joking good-naturedly with his fiancée and blowing bubbles in a couple of Snapchat videos.

"Rob, guess what?" Chyna says in one video before whispering into the camera: "I put that black magic on Rob."

He interjects, smiling, "I put that on you."

@blacchyna on snapchat. @robkardashian #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A video posted by Roblac (@roblac_) on

@blacchyna on snapchat. @robkardashian #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A video posted by Roblac (@roblac_) on

In another video the banter continues. "My black is so beautiful," Chyna says.

"Yes, dear," Rob responds.

@blacchyna on snapchat. @robkardashian #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A video posted by Roblac (@roblac_) on

Amber and Sebastian made another a brief appearance when Chyna celebrates her score on an arcade game.

@blacchyna on snapchat. #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A video posted by Roblac (@roblac_) on

The fun weekend was also an excuse for an epic cheat meal for the mother-to-be, who is due in just a few weeks -- a cheesesteak sandwich, a hoagie and cheese fries. As Chyna says, "When you can't decide on one sandwich, just eat both."

@blacchyna on snapchat. #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A video posted by Roblac (@roblac_) on

@blacchyna on snapchat. #blacchyna #angelakardashian #blacchynala #snapsave #snapchat #robkardashian #kuwtk #roblac #chyro #robandchyna  #angelawhite

A video posted by Roblac (@roblac_) on

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Earlier this month, Rob celebrated his stepson King's birthday with a super sweet message. Watch this video to see what he had to say.