Amber Rose was spotted smooching Tyga's best friend at her 4th annual SlutWalk this weekend -- and the new couple could mean more run-ins for Tyga and Blac Chyna .
Sources tell us Amber is dating Def Jam Records' Vice President of A&R Alexander 'AE' Edwards, who we're told she's been seeing for a few weeks now ... but she's known him since Tyga and Blac Chyna were together few years back.
We're told Tyga and BC both approve of their respective friends banging -- but don't hold your breath for a double date.