Pink & Gwen Stefani beef? No Doubt songstress 'rejects' rockers' play-date invite, 'not now not ever?'

Does Gwen Stefani have something thing against fellow pop starlet, Pink?

Apparently, the No Doubt songstress and punk rock beauty are duking it out - soccer moms style.

Rumors suggest that the two have never been the best of friends. Now, an insider for RadarOnline reveals that rivalry is "still alive and well," and Stefani's ready to keep it that way.

Pink (real name, Alecia Moore) has an adorable two-year-old daughter named Willow with motocross hubby Carey Hart. Stefani has three children with Bush rocker-turned-husband, Gavin Rossdale - Kingston (7), Zuma (5), and newborn son Apollo.

To officially end the "feud," Pink allegedly wanted to set-up a play-date with the little ones in Beverly Hills. But Stefani wasn't having it. According to the source, Pink was "shocked" when Stefani gave her a blatent "no."

"Pink was pretty upset when she got an email a couple of days later from Gwen that basically said, 'not now and not ever' to the idea that they bury the hatchet by having their small children meet each other,' the so-called insider reveals.

Pink and Stefani kissed onstage at the iHeartRadio Music Festival back in 2012, so it appeared that everything was finally okay:

Apparently not?

Nothing seemed to be bothering Pink at the 2014 Oscars, when she performed a riveting cover of "Somewhere Over the Rainbow" -