The singer is currently on the third North American leg of her year-long Blown Away world tour, which began last May (12), but she was given a two-day break to mark her age milestone on 10 March (13) and she planned to head back home to Nashville, Tennessee to spend much-needed quality time with Fisher.
However, the birthday girl's dream date quickly fell apart after her husband fell ill.
She tells People magazine, "I was like, 'I only have 48 hours. I want to do my laundry and go out to dinner.' But Mike got the flu, so I ended up eating vegan pizza. By myself. I was like, 'I'm not mad at you. I do not want you going anywhere, because I know you feel awful. But I do expect a redo!'"
Underwood had to depart for Europe the next day and her delayed birthday "redo" may have to wait a while - she wraps up her live shows in Abbotsford, Canada on 23 May (13).