Hilary Duff's son blows her kiss while water tubing in new video

July 19 (UPI) -- Hilary Duff shared a sweet video of her son blowing her a kiss while water tubing this week.

The 29-year-old actress posted the cute clip with 5-year-old Luca from their family vacation Monday.

"Casual wave and and air kiss," she captioned the video on Instagram.

Duff had shared a photo Saturday of herself and Luca taking off on their trip. She opened up about her son and life as a mother in an interview with People published last week.

"I have a giant child," the star joked of Luca. "He is just under my chest. I can barely carry him anymore!"

"I just say enjoy every moment," she advised. "Hunker down and not put too much pressure on yourself and really enjoy the days as they come ... [Parenthood is] such an amazing adventure to go on and such a miracle."

Duff shares Luca with her ex-husband, retired NHL player Mike Comrie, from whom she split in 2014. She was spotted kissing SOLr Energy Consulting CEO Ely Sanvik during an outing to the beach this month.

"They were in Malibu," a source told E! News. "They played cards on the beach, hugged and kissed each other a lot. They were both very friendly and talked with everyone."

Duff came to fame on the Disney Channel sitcom Lizzie McGuire, and presently stars on the TV Land series Younger. She confessed in June that she "didn't know how to respond" after Luca recently discovered she's famous.

"I picked him up from school and when we got home he's like, 'I know your name,'" the star told Good Morning America. "I was like, no, I'm not ready for this yet!"