Reality star and entrepreneur Kardashian, age 44, posted a video on Instagram detailing the moment.
Barker is the drummer for Blink-182.
Spotting the sign, he jumped off stage and kissed his wife, as the crowd roared.
Kourtney KardashianRichard Shotwell/WWD/Penske Media via Getty Images
The couple had undergone IVF, but were not successful.
They each have children from prior relationships, with Kardashian sharing three children with Scott Disick.
Barker, age 47, also has three children with ex-wife Shanna Moakler.
