Kisses for baby Luca! Hilary Duff and her sister, Haylie Duff, took Hilary's adorable son Luca, 11 months, for a swim on Wednesday, March 6.
PHOTOS: Hollywood kids -- the cutest pictures ever
The sisters, both wearing swimsuits with their hair pulled up, posed for a picture together in the water. Haylie cradled her nephew and they both showered him with kisses.
PHOTOS: Hilary Duff through the years
Hilary, 25, posted the cute photo on Twitter and captioned the shot, "Waterbug." Haylie, 28, also tweeted, "Swimming with my Seester and Luca. Favorite way to spend an afternoon."
PHOTOS: Hilary Duff's life as a new mom
Though he's probably still learning how to swim, little Luca has recently learned how to walk.
"Well, I officially have a walking baby on my hands!" Hilary announced on Twitter Feb. 28 of her son with husband Mike Comrie. "It's hilarious . . . the wobble makes it look like he's 3 drinks in!"
This article originally appeared on Usmagazine.com: Hilary Duff, Sister Haylie Give Baby Luca Kisses While Swimming: Picture
Check out Jessica Alba, Reese Witherspoon, and more stars who recycle their wardrobes.
It's been 20 years since "Jurassic Park" came out. See what the cast of the movie is up to these days.
Check out some of January Jones' most retro wardrobe choices from over the years.
Take a look back at Mark Wahlberg's best shirtless looks over the years
From Benji Madden and Cameron Diaz to Mariah Carey and Nick Cannon, take a look at some of Hollywood's strangest couples.
Find out what happened to the stars of 'Garden State' after they made the hit indie film.
From Heidi Klum and Seal to Ryan Sweeting and Kaley Cuoco, see which stars got tattoos for love.
© 2014 Microsoft