Madonna was in the studio with Katy Perry just hours before she become ill and was taken to the hospital

Madonna was in the studio with Katy Perry just hours before she become ill and was taken to the hospital.

“Madonna has long admired Katy, and they have worked together before, but never managed to actually put anything out,” an unidentified source told The Sun of Perry, 38.

Apparently, the “Material Girl” singer was “working around the clock” to fine tune her music and upcoming tour, which “are second to none,” the source claimed.

“Obviously everything has been put on hold now, but the fact she was in the studio with Katy just hours before being rushed to the ICU shows how determined she was to push ahead despite feeling unwell,” the source alleged.

MailOnline has contacted representatives for Madonna and Katy for comment.

The pop legend is now said to be back home and recovering, although it could take months before she is back at full strength.

It is still not clear what type of infection she had, but experts said that intense preparation for her tour and gruelling workouts may have left her more susceptible to normally harmless infections.

After reviewing photos taken in the days before her illness, doctors said she looked ‘exhausted’ and appeared ‘thin’.

In a photo posted to Instagram four days before her hospitalisation with the caption ‘the calm before the storm’, she is shown lying on the floor while wearing a black jumpsuit and fishnet tights.

Her hair and makeup are immaculate with nothing out of place, although she also appears ‘thin’ — said Dr Thomas Moore, an infectious diseases expert at the University of Kansas.