Ahead, see which celebs joined them to party in honor of Saturday Night Lives newest episode.

Best star snaps of the week: Beyonce, Brad Pitt and more

Jelly Roll attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Jelly RollProbe-Media for NY Post

Post Malone attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Post MaloneProbe-Media for NY Post

Maya Rudolph attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Maya RudolphProbe-Media for NY Post

Zachary Quinto attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Zachary QuintoProbe-Media for NY Post

Post Malone attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Post MaloneProbe-Media for NY Post

Steven Spielberg attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Steven SpielbergProbe-Media for NY Post

Dana Carvey attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Dana CarveyProbe-Media for NY Post

Jim Gaffigan attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Jim GaffiganProbe-Media for NY Post

JJ Abrams attends the SNL 50th season premiere afterparty at Cathedrale in NYC

J.J. AbramsProbe-Media for NY Post

Lorne Michaels attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Lorne MichaelsProbe-Media for NY Post

Dana Carvey attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Dana CarveyProbe-Media for NY Post

Bunnie XO attends the SNL 50th season premiere afterparty at Cathedrale in NYC

Bunnie XOProbe-Media for NY Post

Jelly Roll performs on SNL 50

SNL Performer Jelly RollNBC / SNL

Jean Smart performs on SNL 50

SNL Host Jean SmartAP

Best star snaps of the week: Beyoncé, Brad Pitt and more