Amber Rose Breaks Down On 'DWTS'

Amber Rose is feeling the pressure of her next -- and possibly last -- appearance on "Dancing with The Stars" ... she even broke down in tears during rehearsal.

We got video of Amber going through her Monday night routine with partner Maksim Chmerkovskiy, and after a few missteps, the frustration finally poured out.

Check out the clip -- Amber confirms ... professional dancing ain't no walk in the park.

Sources close to the production tell us there's a lot more going on behind the scenes that pushed Amber to being so emotional. We're told Monday night's theme is "Most Memorable Year" -- and Amber's is 2013 ... when her 3-year-old son, Sebastian, was born.