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Rob Kardashian, Blac Chyna

Snapchat

Well, would ya look at that smile?!

Rob Kardashian showed off his pearly whites in a Snapchat photo that was just too sweet to ignore. Flashing the biggest smile we've seen from him in a long time, the E! star seemed to be the happiest guy in the world on his girl's Snapchat post, and why wouldn't he be? He was getting smooches from his lady.

Blac Chyna grabbed her beau's face in the snap, and snuggled up to give him a loving kiss on the cheek, resulting in a very cute PDA moment between the two lovebirds.

Rob Kardashian, Blac Chyna

Snapchat

Their presh moment seemingly came after a photo they posed for on Rob's Snapchat, which showed Kardashian giving his (still-nice-but-not-as-genuine-looking) smile to the camera while his arm is around Chyna, who was preparing to ambush him with a kiss, as you can tell by her hand creeping up to his face and her lips already pursed.

Still a great picture, but we're a sucker for candids. And that one was perfect.

In recent weeks, E! News has learned that Rob has been working much harder in and out of the gym. Most importantly, the fitness routines are happening on a more regular basis. A source further explained that Rob has been "taking better care of himself since his health scare" and Chyna is helping him continue along that path.

In fact, Rob showed off his progress when the pair were recently seen together in Los Angeles where they stopped at an undisclosed office building.

"Progress = Happiness," read his Instagram post Tuesday afternoon when the pictures first surfaced.

Apparently, so does kisses from Blac Chyna.

Watch the season finale of Keeping Up With the Kardashians Sunday night at 9 p.m. only on E!