De Blasio's campaign sent an email bearing Baldwin's name Thursday morning soliciting contributions and offering donors a chance to win two seats at an upcoming fundraising dinner.
With a subject line reading, "I'll save you a seat," the message signed "Alec" asks recipients to donate "$10 or whatever you can afford."
"New York needs a mayor who will stand up for every New Yorker: one who is willing to ask the wealthy to pay a little more so that every child has access to early education and after-school programs, one who knows that strong community-police relations are essential to public safety and one who understands the inequality crisis facing our city and has the strength and compassion to bring us back together," the funding pitch said.
When and where the dinner will be held are not provided on de Blasio's website.
De Blasio's celebrity backers include Cynthia Nixon, Sarah Jessica Parker and Alan Cumming.
As far as celebrity endorsements go, mayoral hopeful and City Council Speaker Christine Quinn reportedly has Brooke Shields, Candice Bergen and Whoopi Goldberg in her corner.