Jenna Bush Hager is as pumped as anybody for Taylor Swift's wedding ... but she's pumping the brakes on Ryan Seacrest as a possible officiant.
We caught up with the "Today with Jenna & Friends" cohost outside of 30 Rockefeller Plaza in New York City Thursday, where she told us she thinks Tay Tay's future nuptials with NFL tight end Travis Kelce will be chock-full of celebs ... but definitely doesn't think Ryan will make a cameo officiating the ceremony.

As you know, TS and TK announced their engagement over the summer, and since then, everybody has been interested in the wedding .