You oughta know … Alanis Morissette is pregnant with her second child.

The singer-songwriter revealed she is expecting her second baby with husband Mario “Souleye” Treadway in a cute video that features a song she recorded back in 2010.

The video starts out seeming like a sweet tribute to her husband on their anniversary — with her singing “happy anniversary, baby”, but it turns into something more unexpected.

It tracks the couple’s love story, showing their marriage and the birth of their son, five-year-old Ever Imre, and culminates in shots of the family of three looking at an ultrasound to announce that Alanis is pregnant.

The Ironic singer added the caption: “The story of my nuclear family in moving pictures, brings us up to this sweet moment.”

She wrote on her website that the song was “written, recorded and produced in 6 hours on May 22, 2010 with Guy Sigsworth, on the sly, to surprise Souleye”.

Mario Treadaway and Alanis Morissette at Elle's 6th annual women in music concertThe couple have been married since 2010 (David Crotty/AP)

She added: “May this song take on ever-deepening meaning as each year goes by.”