The former Ugly Betty star, 33, was at the event to promote her TV sitcom Superstore.
star looked picture perfect in the short-sleeved black frock dotted with red flowers.
Her dress had a high neck and was gathered at the waist before falling in a full skirt to just above her ankles.
She added red sandal heels to complete the ensemble.
Amer wore her dyed honey blonde hair styled in gentle waves and tucked behind one ear.
She rimmed her eyes with black liner and mascara and sported matte dark pink lip color.
Amer, who also serves as a producer on Superstore, stars as an associate at a fictional big box store in St. Louis, Missouri, who's worked her way up to management, and hwo hates anyone knowing her real name.
The third season of the comedy is slated to debut next month on the Peacock network.
She was joined at the TCA event by her co-star Ben Feldman, 37, who rocked a patterned tee under a blue tailored jacket paired with dark gray pants and black trainers.