Despite her ill-health, the actress had to report for work after the star allotted his dates for their upcoming film 'Dhoom 3'

While buzz is that Katrina has been unwell for a while, apparently the actress had no choice but to shoot for her upcoming film Dhoom 3.

And that's apparently because her co-star Aamir Khan has already given his dates. Kat is said to have already reported on the Yash Raj sets to film her portions.

A source says, `Kat's been down with viral fever. Last seen at Arjun Kapoor's birthday party, she was resting at home as she was feeling weak. But thanks to Aamir, the actress is now back at the YRF studio for the shoot schedule.

Aamir had already allotted his dates.`We heard from those close to her that her hectic schedule is to blame for her health woes. `However, Kat didn't want Aamir's dates to be wasted,` adds the source.