Heidi Montag rubs Holly Montag's pregnant belly on the beach in Santa Barbara on Feb. 22. Credit: Splash News Online

It’s almost time for Heidi Montag to become an aunt! The Hills star, 28, is anxiously awaiting the birth of her sister Holly Montag’s first child. The little one is due around May, and the sisters have been spending some quality time together before the arrival of Holly’s baby. 

The Marriage Boot Camp star and her glowing sis, 31, were spotted walking the beach near Heidi’s home in Santa Barbara, Calif. on Sunday, Feb. 22. Holly wore a black and white bikini top with a wrap skirt.

In a peach bikini and surfing wetsuit, Heidi rubbed her sister’s growing baby bump while laughing and walking barefoot through the sand. She was later photographed bending down and listening to Holly’s stomach. 

Spencer Pratt and his wife are currently starring on the latest season of Marriage Boot Camp: Reality Stars, where they have been addressing their own martial issues. Heidi desperately wants children of her own while Pratt, 31, has been more hesitant. 

"If we named our child Speidi, it would be incredible," Pratt joked to Us Weekly back in January. "It would be Speidi Pratt, legally."