CHICAGO (AP) — President Barack Obama is giving it up for the Chicago Cubs.

Obama posted a message of “Holy Cow” and congratulations Sunday on Twitter, adding, “Even this White Sox fan was happy to see Wrigley rocking last night.”

Obama is a well-known fan of the Cubs’ crosstown rivals, the Chicago White Sox.

First lady Michelle Obama beat the president to it earlier Sunday with her own tweet celebrating the Cubs’ pennant win.

The Chicago native on Sunday morning tweeted, “Way to go Cubs!!” She then recalled her father, saying “My Dad is the reason I’m a true Cubs fans. He’d be so proud!”

She signed off on the tweet from her @FLOTUS account with her personal signature, “-mo,” meaning she wrote the message herself.

Even the Cubs crosstown rival, the White Sox posted its congratulations to the National League champions on Twitter. The White Sox’ most recent World Series win was in 2005.

The city’s other professional sports teams are also adding their praise. Tweets from the Chicago Bulls, the Chicago Bears, the Chicago Blackhawks and the Chicago Fire are saluting the Cubs.

Chicago Mayor Rahm Emanuel issued a statement Saturday night celebrating the pennant win. He said,  “The fun continues in Cleveland on Tuesday night.”

Chicago faces the Cleveland Indians in Game 1 of the World Series on Tuesday.

(TM and © Copyright 2016 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)