Jeana Keough

Ain't nothin' like an original ... Jeana Keough is coming back to "The Real Housewives of Orange County" -- but she'll be a part-time cast member ... for now. Jeana's been shouting from the rooftops about her return to the show she left in 2009 -- but production sources tell TMZ her camera time…

If you dream of living like one of the "Real Housewives of Orange County" ... all you need is $3.5 mil ... and some breast implants ... because one of the original stars is selling off her famous home. TMZ has learned ... Jeana Keough has listed her 8,000 square foot Coto De Caza mansion ... made…