Radar Online claims that MILEY CYRUS is dating THEO WENNER...the son of "Rolling Stone" founder JANN WENNER.
A source says, quote, "Miley talks about how hot Theo is and how nice he's been to her. She's definitely completely in lust with him...She said she's never met anyone as sweet as Theo."
Theo is 26...and he previously dated LIV TYLER, who's 10 years older. (Miley turns 21 next month.)