The Sopranos alum married her fiancé of almost three years, pro baseball player Cutter Dykstra, in a candlelit, desert chic wedding in front of more than 150 guests at the Parker Palm Springs hotel in Palm Springs, California, on Saturday, PEOPLE exclusively confirms. "Jamie was glowing," says a guest. "She looked breathtaking. She couldn't be happier. You could feel the love."
The festivities kicked off on Friday night with a welcome reception at the Palm Court Lawn where guests snacked on tray-passed hors d'oeuvres and s'mores around a fire pit.
The Saturday ceremony – where Sigler wore an Oscar de la Renta dress and Forevermark Diamonds jewels and Dykstra wore a suit by Brooks Brothers – took place on the Croquet Lawn under a tree followed by dinner and dancing in the hotel's ballroom. Singer Lance Bass, who is close friends with the actress, officiated the ceremony, during which the couple said their own vows and their 2-year-old son, Beau, walked down the aisle in a miniature tuxedo holding a baseball homeplate that said "Here comes my mommy." The couple's dog, Bean, also took part, leading Dykstra's niece down the aisle.
"I just wanted it to feel like a wonderland with candlelight," says Sigler, 34, who was escorted down the aisle by her father. "I'm excited about just seeing everyone have a great time because we put so much heart and love into this."
Dinner included pan-seared sea bass, New York Strip steak and roasted vegetable napoleon. Guests were also treated to a lavish desserts table before toasting the couple with Ace of Spade champagne. Floral arrangements including peonies, roses and dahlias, were designed by Blooming Gypsy florist in San Diego.
At the reception, guests, which included Lea Michele and JoAnna Garcia Swisher, danced to '80s cover band The Spazmatics.
"I am completely overwhelmed with emotion," Swisher said of the wedding to PEOPLE. "Cutter and Jamie are one of the most incredible couples I know. Watching them make this commitment in front of so much love and their perfect son, Beau, is just the most amazing thing."
Michele also shared her thoughts on the romantic nuptials to PEOPLE: "Getting to see this amazing couple share such a beautiful moment among all of our friends and their families was so amazing. I couldn't be happier for my friend Jamie on this wonderful day."
Planning everything herself along with her best friend, Sigler wanted the wedding to have a very cozy, "homemade" feel with twinkle lights, blankets, pillows and candles. At the end of the festivities, guests were given parcels that included Casamigos tequila and Alkaline H2O from Pressed Juicery.
For more details inside Sigler and Dykstra's wedding, including exclusive photos, pick up next week's issue of PEOPLE, on newsstands Friday
Sigler and Dykstra, 26, who were first introduced by Swisher and her husband, got engaged in 2013. Their son Beau was born later that year. "Anytime I look at Cutter and Beau, I'm overwhelmed with emotion," Sigler says. "My dad has said to me on several occasions that Cutter is exactly who he would want for me. It means everything that my dad feels that way about him."
As for the wedding, "we just wanted everyone to be relaxed and have a great time. It's laid-back, not fancy. That's who we are as a couple so we wanted the wedding to represent us."
"And our son gets to stay up late and eat as much cake and candy as he wants," Sigler adds. "I think it's so cool that I have that memory with him."