Mistaken For Lindsay Lohan, Hayden Panettiere Enraged

Hayden Panettiere was apparently P-I-S-S-E-D when a pair of squealing fans mistook her for Lindsay Lohan at a boutique on Melrose Ave. in Hollywood last week.

The Heroes actress was happy to have their attention, according to reports, until one of the fans called her “Lindsay” and asked when she'd be back on Ugly Betty.

Hayden's response: "Don’t EVER call me that again! You have NO idea what an insult that is!” Ouch. Hayden better watch out or she'll incur the wrath of SamRo.

Is being mistaken for LiLo really that bad? Tell us ...