Carrie Underwood & Gloria Estefan Party Post-AMAs in L.A.
11/20/2012 AT 06:00 AM EST
After winning best country album at the 40th Annual American Music Awards on Sunday, Carrie Underwood and husband Mike Fisher celebrated at Koi Los Angeles.
"They looked happier than ever. Carrie seemed overjoyed and excited throughout the evening and every time her husband made a toast," an onlooker tells PEOPLE. "Her demeanor made it obvious to everyone – even those who didn't catch the show – that she had taken home an important award."
Underwood and Fisher weren't the only two enjoying Koi after the AMAs. On the back patio, Gloria Estefan, joined by her husband and several friends snacked on signature sushi rolls and crispy rice.
Still dressed up from the awards, the group "laughed and enjoyed themselves all night," the source adds. – Carlos Greer