Hulk Hogan's Ex-Wife Linda -- Starring as 'MILF' in New Rap Video

She hasn't even been single for a week ... but Linda Hogan has already found a famous gentleman caller ... who just booked the 52-year-old to star in a music video about a "MILF."

TMZ has learned ... Hulk's ex is in talks with hip hop artist Ricky Romance -- who says he wrote the song "MILF" specifically for Linda ... including the following lyric:

"I guarantee you'll forget about that divorce the moment we roll out in my Porsche ... I'll beat it of course, yeah, daddy do that ... looks like Stella just got her groove back."

Romance tells TMZ ... "I'm in love with [Linda]. I wrote the song for her hoping to get her attention ... it's a perfect time since she is single now."

He adds, "I hope to marry her and have our first child by next year."