The friendship lines are blurred — and lies are spreading like wildfire — in the official trailer for season 19 of The Real Housewives of Orange County, all thanks to Gretchen Rossi and her onscreen return.

“There’s a snake in this group,” Shannon Beador says in the trailer, which dropped on Thursday, June 5, as the group of ladies are each hooked up to a polygraph machine.

Tamra Judge teases, “No one likes a liar,” as glimpses of her castmates all in the hot seat flash across the screen.

Gretchen, meanwhile, makes her presence known this season after returning as a “friend” following a 12-year absence. “Make it make sense! Why?” Gretchen, 46, screams at Heather Dubrow during one scene.

“12 years you’ve been going after me!” Tamra, 57, yells at Gretchen, hinting that their friendship d

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