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Nicki Minaj has been tweeting Mariah Carey to congratulate her on giving birth to twins.
The singer and her husband Nick Cannon became the parents of a baby girl and boy who have not yet been named.
Carey's representative, Cindi Berger, said the girl was born first, weighing 5lb 3oz (2.35kg). Her brother weighed in at 5lb 6oz (2.44kg).
Cannon was so nervous he went to the wrong department at the hospital, and was guided to the maternity ward by a nurse.
"It was like right out of an 'I Love Lucy' skit," said Berger, referring to the 1950s US TV comedy.
Berger says they were listening to Carey's song We Belong Together after the children were born.
Minaj wrote, "Congratulations Mariah & Nick! The twins have finally landed on earth! Yaaayyyyy!,"
Carey's One Sweet Day collaborators, Boyz II Men, wrote, "Just got the news! Congrats Mr and Mrs Cannon on ur (your) twin babies!! Look forward to sleepless nights for the next few weeks...