Jennifer Aniston & Justin Theroux: Separate Coasts, Separate Birthday Parties!

Jennifer Aniston keeps a low profile as she heads out of Crossroads restaurant after attending the birthday celebration of her pal Portia de Rossi on Friday night (January 31) in West Hollywood, Calif.

The 44-year-old actress was also joined by Portia‘s wife Ellen DeGeneres.

PHOTOS: Check out the latest pics of Jennifer Aniston

That same night, Jen‘s fiance Justin Theroux stepped out for Howard Stern‘s birthday bash at the Hammerstein Ballroom in New York City.

Other attendees included Heidi Klum, Lena Dunham, Chelsea Handler, and Adam Levine.

10+ pictures inside Jennifer Aniston and Justin Theroux at different parties…