The "Real Housewives of Orange County" stars had a real big blow out!

On Monday's episode of the Bravo reality series, Vicki Gunvalson seriously lost her cool when confronting costar Lauri Peterson about the cheating and threesome rumors she's been spreading all season long.

Check out the clip below to see Vicki go HAM on Lauri!

Throughout this season, Lauri has been trash-talking her former boss/costar ... and things finally came to head on the ladies Canada vacay.

Vicki also admitted to "infidelity issues" she and her ex-husband Don Gunvalson had throughout their marriage, which seemed to please costar Gretchen Rossi (whose past relationships have likewise faced cheating accusations from Gunvalson).

See Vicki confront Gretchen and admit to cheating (many times) below:

It will be interesting to see what else happens this season with Lauri ... who has been happily stirring the pot since joining the cast (again)!

What do you think of the blow out? Tell toofab in the comment section below!

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