Christina Aguilera thinks Hayden Panettiere is like ''a little feisty Pit bull.''

The 'Your Body' hitmaker says she is a huge fan of the 'Nashville' actress and formed a close bond with her while guest-starring on three episodes of the TV series.

She said: ''I like her a lot because she's one of those little feisty Pit bulls, like, small packages, big bites. I love that. I was such a fan of hers.''

The 34-year-old singer, who has six-month-old daughter Summer Rain with fiancé Matthew Rutler and seven-year-old son Max with ex-husband Jordan Bratman, also couldn't resist asking the pint-sized star, 25, about her Ukrainian boxer fiancé Wladimir Klitschko, who stands more than a foot taller than her at 6'6''.

She told E! News: ''I was like, 'What's it like being married to this big, huge boxer, what's that like?' because I'm a huge boxing fan.''

Asked if she would consider returning to the country music drama in the future, Christina added: ''For sure! I had such a great time. They were so welcoming and so sweet to me. It was a great experience that I got to leave with. A lot of love in the air. Everyone was super, super fun!''