Tamra Judge "goes nuclear" on Heather Dubrow in "nasty" RHOC return.

Before the anticipated later this spring premiere of Season 17 of "The Real Housewives of Orange County,

 Tamra Judge reportedly reclaimed her orange. According to Page Six, she then reportedly had conflict with "Fancy Pants" Heather Dubrow.

The two allegedly "butted heads" the entire time the cameras were rolling,

but the real spat took place on an explosive cast trip to Mexico.

Our sources claim that while away, Judge, 55, organized a "gang-up" and attacked Dubrow, 54, in a "nuclear" fashion.

We are told that the argument was "nasty." We are also informed that Judge introduced newcomer Jennifer Pedranti,

a mother of five and yoga instructor, to the group, but that their relationship deteriorated while they were filming.