Instagram / Mike Fisher
None of us will ever sound this good on helium...
Carrie Underwood's husband Mike Fisher posted on his Instagram page on Wednesday night a hilarious video of her singing "Happy birthday" to their eldest son Isaiah Michael Fisher, 4, after inhaling from a yellow birthday balloon filled with helium.
The 35-year-old Grammy-winning singer serenaded the boy, who looked highly amused, while holding his 1-month-old baby brother, Jacob Bryan Fisher.
"Happy birthday Isaiah!!" Mike wrote.
This weekend, Carrie and her family celebrated Isaiah's birthday early with a Muppets-themed birthday cake.
"Ummm... @iveychildersand @iveycakestore have outdone themselves once again! Isaiah loves the Muppets and his favorite movie right now is Muppets Most Wanted," Carrie wrote on Instagram, alongside a photo slideshow.