Matt Damon, dressed in an astronaut’s suit, sits atop of the five-year-old Willow’s cake.
"Matt Damon made it after all," Pink wrote below the image on Instagram.
The singer admitted that her daughter is a huge fan of his latest film ‘The Martian’, as well as of the actor himself.
"It's good. She loves it. I love it. I thought it was great, but I don't love it the way she loves it," Pink said. "She asked me if Matt Damon can come to [her birthday party]. I think she has a crush."
Although Willow is a little embarrassed about her crush, Pink doesn’t seem to be.
"She's already upset with me because there's a new game we play called Ask Siri -- which, she just found out last week there's a Siri -- and I said, 'Siri, Willow-Matt Damon' and all this stuff came up," she told ET. "[Willow]'s like, 'How do they know?' She got mad at me!"