Sheryl Crow found out her former fiance Lance Armstrong was dating a "really famous actress" as she battled cancer.

The 64-year-old singer has revealed her life imploded back in 2006 when she split from the cyclist in the same week she was diagnosed with breast cancer - and she then found out her former partner had already moved on.

During an appearance on The Bobbycast podcast, she explained: "I was engaged, I had three beautiful stepchildren, I wanted to have kids with this person [Armstrong].

"We split in the same week I got diagnosed with breast cancer, and I found out he was seeing a really famous actress. I went through about nine months of radiation and grieving and anger."

The If It Makes You Happy star struck up a romance with Armstrong in 2003 and they became engaged two years later. However, the couple split in 2006.

The cyclist later detailed the break-up in his 2009 memoir Lance: The Making of the World's Greatest Champion, claiming they parted ways because Sheryl wanted children and he didn't became he already had three kids with his ex-wife Kristin Richard.

Armstrong wrote: "She wanted marriage, she wanted children. Not that I didn't want that, but I didn't want that at that time because I had just gotten out of a marriage, I'd just had kids.

"Yet we're up against her biological clock - that pressure is what cracked it."

Armstrong went on to have two more children with his second wife Anna Hansen, who he married in 2022, while Sheryl started a family on her own a year after her split from the cyclist when she adopted her son Wyatt in 2007.

She became a mother for a second time when she adopted another little boy, Levi, in 2010.

The singer also relocated to locate to Nashville, Tennessee to be closer to her family.

She previously told Variety: "We all have those moments in our life where we have to pivot. I was diagnosed with breast cancer in 2006, and I moved here in 2007.

"I think having come out of a relationship where I thought I was gonna be married and was close to the kids that were gonna be my stepkids, then got diagnosed - all three of those things made me reassess.

"I just looked at it and thought, 'I want to put down roots; I want to have a family.' My sisters live here, and my family all lived within three hours, and I just decided to start phase two."