Olivia Wilde and son Otis played in sprinkler fountains in Brooklyn, Wednesday

Hot fun in the summertime!

Olivia Wilde shared a picture enjoying mother-son time with her rarely seen son Otis Alexander on Instagram on Wednesday.

In the image, Wilde, 31, and baby Otis, who celebrated his first birthday on April 20, are cooling off in a water sprinkler in New York City’s Brookyln Bridge park.

“#BrooklynBridgePark #PleaseTouchTheArt #TheStrokes,” captioned Wilde.

In the photo, Wilde beams from behind aviator sunglasses, while little Otis is mesmerized by the rising and falling water. The tiny star is rocking a The Strokes band tee.

Olivia Wilde

Courtesy Olivia Wilde

Otis is the first child for the Meadowland star and fiancé Saturday Night Live alum Jason Sudeikis, 39. The couple got engaged in 2013.

Earlier this year, Wilde opened up about motherhood and the post-baby body expectations celebrity moms face. “The truth is, I’m a mother, and I look like one,” she told Shape magazine’s April issue.

“I believe in a world where mothers are not expected to shed any physical evidence of their child-bearing experience.”

— Lindsay Kimble