The 49ers’ first-round draft pick is officially under contract.

Eric Reid, the safety drafted No. 18 overall by the 49ers in April, announced the signing through social media. “Beyond blessed! Officially a 49ER!” Reid wrote on Twitter, with a link to an Instagram picture of him signing.

The 49ers traded their first- and third-round picks (No. 31 and No. 74) to the Cowboys to move up to No. 18 to draft Reid, who was an All-American as a junior last year at LSU.