The confusion began when Reeves, 55, hit the red carpet with artist Alexandra Grant, 46, at the LACMA Art + Film Gala over the weekend. With her beautiful, silver hair pinned back, Grant had an uncanny resemblance to the 74-year-old Oscar winner, and fans went wild.
"Y'all I'm not gonna lie, I didn't have my glasses on the first time I saw it today and I thought Keanu Reeves was dating Helen Mirren," one person tweeted.
"I saw that," Mirren told ET -- referring to the social media uproar -- while on her own red carpet at the premiere of her new movie, "The Good Liar," in New York on Wednesday. "That was very flattering on me, you know, because she's obviously lovely."
Y'all I'm not gonna lie, I didn't have my glasses on the first time I saw it today and I thought Keanu Reeves was dating Helen Mirren.
Reeves and Grant have previously been linked as creative and business partners, collaborating on the books "Ode to Happiness" and "Shadows" in 2011 and 2016. The two also started a publishing company together.
Meanwhile, "The Good Liar" marks the first time Mirren has worked with Ian McKellen for a film, which is directed by Oscar-winner Bill Condon.