Eva Longoria.Photo: Jason Koerner/Getty

2018 Global Gift Gala

“The best part of being a mom is that I get to see every stage my son encounters and I think it’s the best thing ever,” Longoria, 43, told PEOPLE of 5-month-old Santiago before co-hosting the third annualGlobal Gift Galaat the Eden Roc in Miami Beach Thursday night during Art Basel.

“Like the first time he giggles, I think that is the best part of being a mom,” she added. “Then he goes to another stage where he rolls over, and I think that is the best. Everything he does is thebest thing about being a mother!”

“Santiago goes to work with me and is so sweet — he causes no trouble,” she continued. “Hecomes on the set, but so far hasnot given an opinion of my work! When I direct, he watches me and pays close attention. If he decides to be an actor when he grows up, of course I would support him!”

Longoria and her husbandJosé “Pepe” Bastónare planning a special holiday celebration with Santiago later this month, and are hoping to create new traditions to repeat each year.

“This will be my firstChristmaswith Santiago and I am so excited,” the star told PEOPLE. “We are taking him to Mexico with my husband’s family.”

She continued, “Of course, we will decorate the tree,have Christmas Eve dinner anda gift exchange. But we are hoping to develop some new celebration ideas that Santiago will love, and that we can repeat in coming years.”

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“Santiago’s siblings are crazy about him,” Longoria told PEOPLE. “They want to take him everywhere, and they FaceTime with him daily when possible.”

Whatever she is doing for work, charity or business, the part of theday that gives her the most pleasure iswhen she smooches her son goodnight before she goes to bed.

“My greatest therapy is when I look at his smile and kiss him,” raved the new mom. “I have never known such happiness.”

source: people.com