The actress, 46, is best known for playing Sabrina Spellman from 1996 until 2003 and this weekend was snapped cosying up to former NSYNC singer Chris Kirkpatrick.
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Melissa stood out in a green printed shirt and white trousers, covering up in a tan leather jacket.
As she posed for photos on the red carpet, she was joined by Chris, 51, who put an arm around Melissa while they beamed for the cameras.
This year’s 90s Con took place in Hartford, Connecticut and saw a whole host of famous faces from the decade turn up to meet fans.
Melissa – who shares sons Mason, 17, Braden, 14, and Tucker, 10, with husband Mark Wilkerson – previously opened up about the possibility of a Sabrina reboot.
She told E! Online: “As much as I had a blast on the show, I think [a reboot] would be over-critiqued.
“I’ve never really wanted to go back to Sabrina.”
Further dashing fans’ hopes, she later added: “I just don’t think it would be as great as the original.
“I just don’t think there’s any way. People are nostalgic for what they had. Trying to recreate that can be really difficult, as we’ve seen.”
During the 90s Melissa also starred in the title role of series Clarissa Explains It All, which originally ran from 1991 to 1994.
From 2010 until 2015 she appeared in sitcom Melissa & Joey, alongside Joey Lawrence.