The reality TV star made the announcement during the band’s concert at Los Angeles’ BMO Stadium, later sharing a video of the moment online Saturday.
In the footage, another member of Blink-182 is heard shouting, “Someone’s having a baby!” as Barker abandons his drums, hops off the stage and embraces his wife.
The couple are seen sharing a kiss before Kardashian lifts her sign again and lets out a celebratory scream.
The placard was an apparent nod to Blink-182′s “All the Small Things” music video, in which a woman similarly holds up a “Travis I’m Pregnant” sign.
Check out the sign in the 1999 music video below:
Barker has two children with former wife Shanna Moakler, who was a Miss USA titleholder in the ’90s, while Kardashian has three children with her ex Scott Disick.