Maralee Nichols Celebrates First Mother's Day, Poses with Her and Tristan Thompson's Son Theo

"Words cannot express how much I love you, being your mommy is my greatest blessing. You are my world," Maralee Nichols writes of her 5-month-old son

Maralee Nichols with her son Theo
Photo: Maralee Nichols

Maralee Nichols is relishing time with her baby boy.

The 31-year-old model and the 5-month-old son she shares with Tristan Thompson spent Mother's Day "together with loved ones," Nichols' rep told PEOPLE on Sunday.

On Monday, Nichols paid tribute to her son by posting a photo of herself holding Theo while wearing a floor-length dress.

"Words cannot express how much I love you, being your mommy is my greatest blessing," she captioned the snap. "You are my world."

"Happy Mother's Day to all of the amazing mothers out there," she added.

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Tristan Thompson
George Pimentel/Getty; maraleenichols/Instagram

Last month, Nichols shared a photo of herself and Theo wearing matching bunny pajamas to celebrate Easter. "Happy Easter," she captioned the adorable snap.

In February, Nichols revealed the special meaning behind her son's name.

"Theo, my little angel baby," Nichols said in a statement to PEOPLE at the time. "I named you Theo because it means, 'Gift from God.' "

"I had never been pregnant and had been told I might not be able to have children," she added. "I couldn't believe I was pregnant, when I saw you on the ultrasound and heard your little heartbeat I knew I would always protect you and keep you safe. I love you more than you'll ever know. You bring such joy and happiness into my life. My great blessing." maraleenichols Happy Easter 🤍 1d

The birth certificate, obtained by PEOPLE, first revealed Theo's name. In a statement shared with PEOPLE from Nichols, she added that the athlete was not named on the birth certificate "because he was not present at Theo's birth."

The NBA player first confirmed he fathered the baby in January, writing on his Instagram Story, "I take full responsibility for my actions. Now that paternity has been established I look forward to amicably raising our son."

He continued, "I sincerely apologize to everyone I've hurt or disappointed throughout this ordeal both publicly and privately."

He also addressed Khloe Kardashian — with whom he shares daughter True, 4, and was dating when Nichols said the child was conceived. Thompson also has a 5-year-old son, Prince, with ex Jordan Craig.

"Khloé, you don't deserve this. You don't deserve the heartache and humiliation I have caused you," he wrote.

"You don't deserve the way I have treated you over the years. My actions certainly have not lined up with the way I view you. I have the utmost respect and love for you. Regardless of what you may think. Again, I am so incredibly sorry."

A rep for Nichols told PEOPLE in response, "There was never any doubt that Tristan Thompson was the father of Maralee Nichols' baby."

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