And now it emerges that Ms McCartney is repaying the favour, by appearing in the long-awaited Ab Fab Christmas special.
"It's not exactly my idea of fun, but it's Ab Fab , and how can you say no to Ab Fab?" Stella told the Daily Telegraph. "I'm sure I'll be terrifying, but, you know."
Emma Bunton (who was also at Stella's Christmas soiree) is joining the Christmas cast too, playing a friend of Edina's daughter, Saffy.
While the exact storyline is being kept tightly under wraps, it apparently involves Edina and Patsy (played by Joanna Lumley) taking a trip to the Stella McCartney boutique...
We. Can't. Wait.
Click HERE to watch a sneak peek of the Christmas special!