Sinitta, 45, said she is excited to watch her adopted children, Zac and Magdalena, bond with the toddler, reported Contactmusic.
"I feel so honoured. To think I will watch Eric grow up and know him all his life. He'll play with my children too. I feel very protective - and I shall spoil him rotten," Sinitta said.
The former girlfriend of Cowell also expressed her desire to dress up the baby in Gucci.
"We will definitely have our jeans and T-Shirt moments tumbling around in the park," Sinitta said.
"I was touched by Simon's response. He said, 'I want all of our children to grow up together. I adore you and Magdalena and Zac and want us all to stay close'," the actress said.