UPDATE - Looks like it's almost official! Multiple outlets are reporting that Jen and Justin did, in fact, tie the knot yesterday in a backyard ceremony. The couple have yet to confirm, but all signs point to marriage!

Jennifer Aniston and Justin Theroux reportedly had a backyard "birthday" bash for Justin's 44th at their home in Bel Air on Wednesday afternoon. But judging from the cake we spotted in pics (which looked like it had a Muppet bride and groom fixed atop it) and a seeing a Bible-carrying minster entering the home -- the "birthday party" looks awfully like it was really a wedding and wedding reception for the longtime couple, reports TMZ.

Also Justin's birthday isn't until the 10th -- it seems a few days too early and way too extravagant for a 44th birthday party

Celeb friends like Lisa Kudrow, Howard Stern, Sia, Chelsea Handler, Jennifer Meyer, Emily Blunt, John Krasinski, Ellen DeGeneres, Lake Bell, Scott Campbell, and Terry Richardson were also on hand for the summer soiree.