“Extra’s” Billy Bush caught up with Cote de Pablo, who celebrated her 40th birthday as she promoted her return to “NCIS.”

Cote left the show in 2013 and is back for a “five-episode arc” as agent Ziva David.

When asked how her top-secret cameo was engineered at the end of last season, Cote said, “It was a very covert operation going down.”

“NCIS” airs Tuesday nights on CBS.