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Blac Chyna, Rob Kardashian

VM/CPR/FAMEFLYNET PICTURES

Stepping out with his leading lady!

Just two days after celebrating Valentine's Day together, Rob Kardashian and Blac Chyna were seen together in Los Angeles where they stopped at an undisclosed office building.

Behind the wheel of her fancy ride, the model sported a black jacket with a NEFF beanie as she dropped off her boyfriend.

Meanwhile, Rob was wearing a dark blue T-shirt with Los Angeles Dodgers' sweats and a baseball cap as cameras snapped away. While his clothes remained a bit loose, fans couldn't help but notice a positive change in the Keeping Up With the Kardashians star as he continues to work on his fitness.

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

Blac Chyna, Rob Kardashian

VM/CPR/FAMEFLYNET PICTURES

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.

When Rob pumps iron in the gym, Chyna keeps him company, cheers him on and documents his progress on social media. And when online critics bully him, she rushes to his defense.

Fitness routines aside, there's no question that sparks are flying between these two. Whether sharing photos together on Snapchat or wearing each other's clothes, this romance doesn't appear to be slowing down.

Besides, fans are still intrigued by how much Rob spoiled his leading lady on Valentine's Day.

"Look at this really nice painting my babe got for me?" Blac said in her Instagram video while revealing just one of her gifts. "If you look really close, it's actually lyrics to our song.  Happy Valentine's Day Rob!"

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