The Latin superstar's son, Nayib, and his wife Lara Coppola welcomed a baby boy named Sasha on Thursday and the singer promptly took to her Twitter.com blog to celebrate the news with fans.
She wrote, "My heart was already full&now it runs over!There's a new man in my life!Sasha Argento Estefan,our 1st grandson was born at 8:04! I'm in love!"
The singer explained the meaning behind the tot's name, adding, "Sasha is a name of Russian descent that means 'benefactor of mankind'... It was also the other name we had intended for Nayib."
The Grammy winner is also mother to a 17-year-old daughter named Emily.
