The "Riverdale" star, 52, passed away on March 4, five days after suffering a stroke.
Jennie, who starred alongside Luke in the iconic U.S. teen drama series "Beverly Hills, 90210", chose to share a photo of her three daughters on Instagram to celebrate International Women's Day (March 08), and was slammed by her followers for apparently ignoring the actor's death.
"These women," Jennie captioned the sweet photo of daughters Luca, 21, Lola, 16, and Fiona, 12, whom she shares with ex-husband Peter Facinelli.
After being inundated with negative comments, Jennie decided to stand up to the trolls with a fiery message.
"Hi everyone... I chose to post a pic of my girls today. Because they are my life. Because today is a day to celebrate all women. It took a lot for me to want to celebrate anything," she wrote in the comments section on her photo.
"I thought about it and I know that's the way my dear friend would have wanted it. His kids were his life," Jennie added. "And anyone who knew him knows that and knows he didn't give a f*#k about social media."
"So please don't assume or judge or make rude comments. That's really uncool. Sincerely, Jennie."
The actress, 46, previously told People she was "heartbroken" over father-of-two Luke's sudden death.
"My heart is broken. He meant so much to so many. Such a very special person. I share my deep sadness with his family and all who loved him. Such a terrible loss," she sadly shared.