Gotten-Slash featuring Adam Levine. Not so much STP, but interesting:
http://www.youtube.com/watch?v=wv5kdWa_BBQSo not only is this song great (My favorite off the album), but I noticed that Tommy Black, the bassist for Scott's solo band is playing bass here with him... Interesting eh?
Upon further review... It's Todd Kerns not Tommy, but they look super similar