• Rob Kardashian and Blac Chyna went public with their relationship in January this year.

Rob Kardashian and Blac Chyna went public with their relationship in January this year. (Photo : Instagram/Blac Chyna)

Rob Kardashian seemingly has kick started his 29th birthday pretty early with a trip to Legoland theme park along with his new girlfriend Blac Chyna and her son King Cairo on March 16, Wednesday.

Kim Kardashian's brother reportedly travelled down south to San Diego, California, where he enjoyed a busy day at the theme park with the model. The pair, along with the toddler, appeared all smiles as they enjoyed food, rides and plenty of photo opportunities.

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"Pre Birthday Turn up," wrote the former reality TV personality to caption a pic on Instagram in which he is seen posing with his girlfriend next to a giant house made out of LEGOs. While he kept it simple in a plain white T-shirt and blue Los Angeles Dodgers cap while Chyna donned a black sweater with colourful Adidas logo, black leggings and bright yellow sneakers. 

Chyna kept her fans updated as she posted several videos from their fun getaway on Snapchat. She was seen dancing and hugging Rob on Snapchat as she enjoyed many areas of the park including Imagination Zone and Miniland USA.

The pair is recently back from their PDA-filled vacation in Jamaica. The two have grown closer in the past few months with two of them spending plenty of time together and showcasing their love on social media.

"Things are very serious again and they are completely in love," a source told E! News before further adding that Rob is very thoughtful and giving.

Rob and Chyna went public with their romance in January and have been practically inseparable since then. Their alliance has even caused stiff in the former's relationship with his family members since his sister Kylie Jenner is dating Tyga, who is Chyna's former boyfriend and Cairo's father.

Rob, who last appeared in the family's reality TV show in 2013, is undoubtedly the most reclusive member of Kardashian-Jenner clan and was said to be suffering from depression and obesity. However, since making his relationship public, he has been out and about more and also has been slimming down.

Earlier in the day, Rob was spotted  grinning happily at a gas station as he filled up for his road trip down to San Diego, Us Weekly reported.

Rob and Chyna are also trying to land their own reality TV show. Meanwhile, watch the trailer of "Keeping Up With The Kardashians" season 11 below: