Lena Källersjö is the second wife of Bjorn Ulvaeis. They were married for over two decades.

Björn and Lena are currently separated. The couple no longer lives together. They announced their separation in February 2022.

They have two daughters together. Their oldest daughter, Emma Eleonora, was born on 3 January 1982. Their younger daughter, Anna Linnea was also born on 29 April 1986.

Lena Källersjö is a music journalist. She was also a member of the musical group, ABBA.

Before his marriage to Lena, Ulvaeus was initially married to Agnetha Fältskog, a singer, songwriter, and musician. They were married for eight (8) years (1971-1980). His first marriage bore him two children.