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Neil Patrick Harris

Jamie McCarthy/Getty Images

Very naughty, Neil Patrick Harris!

The 42-year-old How I Met Your Mother alum posted on his Instagram page Saturday a special photo celebrating a major social media milestone.

"Since I've reached 3 million followers on Instagram, I thought I should finally post a dick pic," he said, alongside the photo, a publicity image of Dick Van Dyke from the '60s.

"Yes, it's [a] jolly holiday," one user said.

The Mary Poppins and Dick Van Dyke Show actor, who recently celebrated his 90th birthday, has not commented.

Dick Van Dyke

Mark Davis/Getty Images

More than 30,000 people liked Harris' post.

The actor usually posts family friendly pics on his Instagram, namely photos of his and David Burtka's adorable 5-year-old twins, son Gideon Scott and daughter Harper Grace.

Neil Patrick Harris, Instagram

Instagram

Earlier this week, Harris shared a sweet family pic showing the four making Valentine's Day gifts and cards ahead of Sunday's holiday.