And of course they are excited to have the free agent outfielder Andrew McCutchen.
But during Tuesday's news conference, it was McCutchen's young son who stole the show - as you can see in the video above.
It looks like his 1-year-old son Steel is also thrilled that his new home is in Philly.
The Phillies even tweeted, "Steel has stolen our hearts."
Steel has stolen our hearts. 😍 pic.twitter.com/hGeVBaNUTq— Philadelphia Phillies (@Phillies) December 18, 2018