Rob Kardashian and Blac Chyna have NO boundaries!

The couple took to Snapchat last night to flaunt major PDA — and we hope little Dream Kardashian was sleeping when this went down!

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The lip-locking was seen on Rob's Snap account. Fans even got another glimpse at Chyna's stunning rock.

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News of the couple's tongue wrestling comes after the reality star threw a stack of money at his fiancée's face on the same social media platform. Chyna was not pleased, to say the least.

Scroll through the slideshow to see Rob and Chyna's cutest moments!