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Rob Kardashian

Snapchat

Blac Chyna and Rob Kardashian celebrated his 29th birthday Thursday in a relaxed way: with a low-key dinner party at home.

Rob's girlfriend gave followers an inside look into his birthday celebrations on Snapchat, sharing intimate videos and photos of what he, Blac and her son, King Cairo, did to commemorate the big day. Blac bought Rob a birthday cake, which also happened to be St. Patrick's Day themed (it was March 17, after all!).

Blac, King and a friend sang happy birthday to Rob before he blew out his candles. Later Blac shared adorable videos of her son and his friend playing in Rob's birthday balloons. Suffice it to say the toddlers had a great time with their new toys.

With the kids distracted by Rob's balloons, Blac and Rob were able to have their own bit of fun with Snapchat, using the face swap filter to swap faces.  

The day before the couple brought King to Legoland, where Rob and Blac took cute pics together. Come Thursday morning she and Rob ran errands together, which included stopping at a nail salon and browsing the aisles of a retail superstore. A source told E! News that they wanted to keep his big day fairly simple because Blac has an appearance scheduled Saturday.

"Chyna got him a few thoughtful gifts and she is giving him attention," a source told us. "Chyna has an appearance in Los Angeles on Saturday, so I think they are local and laying low."

Rob's mom Kris Jenner also bought her son a birthday cake, which featured a pair of Arthur George (Rob's line) socks that said "I [heart] You." The cake also had "Happy Birthday, Rob!" written on it. He thanked the momager on his Snapchat for the surprise.