Tareq Salahi Escorts Manhattan Madam Kristin Davis

Michaele Salahi's estranged hubby not only gave a birthday party last for Manhattan Madam, Kristin Davis -- he's going as her date.

Davis famously setup escorts for former NY Governor Elliot Spitzer -- and says she's really looking forward to having Tareq as her escort.

Madam D tells TMZ, she's well aware Tareq's wife/groupie slut recently ran off with Journey's guitarist ... but adds, "I can assure you there's no better place to meet beautiful women than my birthday party!"