MERRY CHRISTMAS!!! Diddy Bought His Girlfriend Cassie Some NEW BREASTS . . . And Cassie SHOWED 'EM OFF Last Night!!! (Did She Go . . . TOO BIG??)

Last night Sean "Diddy" Combs hosted The DeLeón Elite 100 launch event. He hit up Hyde where he toasted many of LA's influencers as he introduced #TheNextLevel in tequila.

On his arm was his lovely GF Cassie - who clearly had new breasts done.

Cassie certainly did reel her man back in - back in August, the cops were called after she and Diddy got into it - after she told him she wanted to end things. Diddy grabbed her phone and started trolling it for other men in her life.