Appearing on Wednesday's "Live with Kelly and Michael," the 24-year-old actress was flashing a large diamond ring that prompted host Kelly Ripa to inquire what it might signify.
Panettiere confirmed she's engaged as the studio audience cheered. She added that she and longtime boyfriend Klitschko haven't set a wedding date.
Panettiere made her entrance on the show wearing a huge, live boa constrictor meant to startle host Michael Strahan, who is not a snake fancier.
Clearly Panettiere's ring, and big news, upstaged even her pet reptile.
On ABC's "Nashville," Panettiere plays scheming up-and-coming country music star Juliette Barnes.
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