Pregnant Anna Kournikova and Enrique Iglesias Are ‘So Excited’ for Baby No. 4 as They Prepare for ‘Controlled Chaos’ (Exclusive)

Anna Kournikova and Enrique Iglesias are ready for their new addition to the family.

A source close to the former tennis star, 44, and the singer, 50, tells PEOPLE exclusively that the couple is “so excited” for their fourth baby and welcoming the “controlled chaos” that comes with a family of six.

“They are so excited, and also spending time getting their other three kids,” the insider says. “[They’re] ready for change and controlled chaos.”

In August, a source exclusively shared with PEOPLE that Kournikova is pregnant, expecting her fourth baby with her longtime partner Iglesias.

“Anna and Enrique are very happy to become parents again,” the source told PEOPLE at the time. “They have proven to be great parents to their three children, and both of them love the process. They enjoy the activities and all that goes along with raising children.”

The source also told PEOPLE that the musician cut back his touring schedule in recent years so that he could spend more time at home with his family.

“He loves his fans and loves to tour, but as he has gotten older and become a parent, it has been harder for him to leave,” the insider added. “He will never forsake his fans, but being a dad is very important to him.”

The new addition will join the couple’s other three children: twins Lucy and Nicholas, 7, and daughter Mary, 5. Since becoming parents, Iglesias and Kournikova have continued their low-key lifestyle but occasionally share snippets of their family life. Ultimately, the source said the soon-to-be parents of four are “happiest” at home in Miami Beach.

“Anna and Enrique are happiest when they are home with their family,” the source said.

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Kournikova recently offered a rare look at family life, sharing a photo on Instagram on Saturday, Oct. 18, of herself and her three kids dressed up for a Halloween outing.

Kournikova wore an oversized yellow duck costume with black pants. Her two girls were dressed in matching orange pumpkin costumes with pumpkin hats and orange Crocs, while her son kept it casual in a yellow ombre T-shirt and black shorts.

The doting mom simply captioned the post with a series of emojis, including two pumpkins, a soccer ball and a duck.