Hayden Panettiere flashes huge diamond ring, sparking engagement rumors with Wladimir Klitschko

The 23-year-old signed autographs and hugged someone on her way out, as shown in a video posted by TMZ.

There have been rumors lately that she will marry her boyfriend, 37-year-old boxer Wladimir Klitschko.

The video has sparked speculation that she and the boxing world champion may want to take the big step.

Hayden started dating her Ukrainian giant in 2009, but split two years later, only to rekindle their relationship in March this year.