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The three other studios are located in Southlake, Texas, The Woodlands, Texas, and Summerlin, Nevada.
Previously one was in Sherman Oaks, California, but has since changed ownership.
The American Idol winner was all smiles and looked radiant in a royal blue sheath dress, which she accessorized with black pumps.
Meanwhile, Isaiah opted for a grey suit with a black button-up shirt and lavender handkerchief.
The couple has been going steady for a while, frequently sharing adorable pictures of each other on Instagram.
Earlier this month, Isaiah dedicated a sweet post to Sparks on National Girlfriend Day, writing, "Shoutout » Maksim Chmerkovskiy and Peta Murgatroyd go glam!
Related: Selena Gomez and The Weeknd Enjoy Comedy Date Night -- See the Cute Pic!
Meryl added, “I absolutely love him, and he’s an incredible person.
We have this friendship that I have no doubt in my mind is a life-long friendship.
Getty Images Later that night, Sparks took the stage and was one of the evening's performers.
Related: Maksim Chmerkovskiy and Peta Murgatroyd Attend Friends' Wedding in Italy -- See the Pics!