Watch 39-Year-Old Mom Wow 'America's Got Talent' Judges With Her Whitney Houston Cover: Exclusive

America's Got Talent auditions are hitting week 5, and this season's batch of contestants are proving to be some of the best yet.

Glennis Grace will take the stage Tuesday night (June 26) to pursue her dreams -- encouraged by her 11-year-old son, Anthony. Her audition song is none other than "Run to You" by Whitney Houston, and Grace's vocals have the bold power strikingly reminiscent of the late diva herself.

The judges are skeptical about why the 39-year-old singer hasn't been discovered yet, but Simon's knowing glance as she hits a note in her sweet spot shows that she has what it takes.

Watch the exclusive video preview, and see the full audition on Tuesday night's episode of America's Got Talent at 8 p.m. ET on NBC.