Leighton Meester teams up with DKMS Americas Founder Katharina Harf for her swab test in New York City on Tuesday afternoon (April 3).

The 25-year-old Gossip Girl actress also teamed up with Kerri Mullen, the 19-year-old blood cancer survivor who inspired the campaign, for a recently recorded PSA.

Along with Vera Wang, consumers will also get a free “Share the Love” tee designed by Vera for DKMS, when they make a $78 purchase from the Vera Wang Lovestruck fragrance collection. Leightis the face of the fragrance!

You can learn more about becoming a donor at GetSwabbed.org!