3:29 PM PST -- TMZ has obtained more footage that shows the moments before Kourtney started flashing her "I'm Pregnant" sign ... and yet a new angle of their passionate kiss.

Check out this video we got our hands on ... it's a new angle that shows what was going on ahead of the big reveal, and it looks like Kourt had a gang of support on hand ready for her to throw up the sign. Once she did, the Blink-182 guys saw it almost immediately ... and flagged Travis onstage. BTW, some of her sisters (and their kids) were there too ... a whole family affair, it seems.

Once Trav reached Kourtney in the front row, they started kissing ... or making out, rather. The angle we saw earlier didn't quite show what we have here -- a straight up lovefest.

Yeah, he's stoked to be a daddy again. Good stuff, indeed.

1:06 PM PST -- Travis Barker was truly stunned when he learned that his wife, Kourtney Kardashian, was expecting a child ... which you can now see in full view in new video obtained by TMZ.

Check out this footage that shows the moment TB got the announcement communicated to him onstage. He seems to be genuinely confused at first, not really realizing the news is for him -- but once it all clicks, you can see his reaction ... shocked and overjoyed.

Just like other videos show, he hops down to embrace KK ... and they smooch. Sounds like the whole thing was just as much as a surprise for him as it was for everyone else.

Congrats again!

Kourtney Kardashian brought down the house at the Blink-182 concert Friday night with some earth-shattering news ... she's pregnant!!

The reality star was standing in a packed crowd watching her hubby Travis Barker and his bandmates perform Friday night at BMO Stadium in L.A. when she raised a large sign bearing an even larger message ... "Travis, I'm Pregnant."

Video of the super happy moment went viral ... showing Kourt smiling and jumping up and down with joy while holding the sign over her head.

After seeing the message, Travis stopped slapping the drums and jumped off stage to plant a big kiss on Kourt, celebrating their first child together.

Of course, everyone in the stadium -- fans and Trav's bandmates -- were cheering for the lovebirds. Kourt's sign, BTW, recreates a scene from Blink's "All the Small Things" music video.

And, no, it wasn't just for show ... Kourt later confirmed the pregnancy on her Instagram story.

As we reported, Kourt and Trav got hitched at a Santa Barbara courthouse in May 2022 after their decade-long friendship blossomed into a romance. A week later, they threw a more lavish wedding at the Dolce & Gabbana mansion in Portofino, Italy.

Around this time, Kourt started documenting her struggles with In Vitro Fertilization (IVF) -- a technique used to help people with fertility problems have babies.

Kourt even talked about it on her family's Hulu show, "The Kardashians," revealing her experience with IVF wasn't great and calling it "awful" at one point. Worse, Kourt said her prescribed medication for her IVF treatments caused her to go into menopause and, as a result, she fell into a depression and gained some weight.

She then put a pause on IVF altogether while freezing her eggs in the hopes of having her fourth child. While we don't know for sure, it's probably a good guess Kourt's egg freezing did the trick this time around. No word yet on No. 4's gender or name, but that should be forthcoming.

Kourtney shares three children with her ex Scott Disick: Mason Disick, 13, Penelope Disick, 10, and Reign Disick, 8. Travis, on the other hand, has 2 kids with his ex-wife Shanna Moakler: Landon Barker, 19, Alabama Barker, 17, plus his stepdaughter Atiana De La Hoya, 24.

Now the couple can add one more kiddo to their enormous blended family list. Congrats you two!!