Weiland, who has been married twice before, has confirmed the happy news to Rolling Stone, revealing he met Wachtel while shooting videos for his Christmas album, The Most Wonderful Time of the Year, in 2011.
He says, "I am incredibly happy. She is incredibly beautiful in every aspect of the word. Lovely, smart, passionate. And she loves my kids and I love her son.
"We're getting married in the spring, and our families will be living together... She's the greatest thing that's happened to me in a long, long time."
And Weiland tells the publication he became attracted to the snapper when she helped to calm his nerves on the video set: "I was kind of nervous because one of the songs (I'll Be Home for Christmas) was a tribute to war veterans from World War Ii on to today. So I'm in this vintage World War Ii dress outfit, and she was taking stills of me.
"I was leaning against this fireplace, and she's like, 'You might want to tuck in your belly a little bit'. It was around the holidays - it was after Thanksgiving, and you know how that tends to be. I was kind of caught off guard, and I started laughing and she started laughing. And I don't know... something magical happened."
Weiland split from his second wife, model Mary Forsburg, in 2007. The couple was married for seven years.