Credit: Larry Marano/FilmMagic

After performing his first night of two sold-out concerts in Miami, Marc Anthony stepped out with his daughter Ariana, 17, and 150 of his closest friends to celebrate his 43rd birthday.

Looking svelte in an all-black Gucci suit, the newly single star joined the group on the 50th floor of the Viceroy's Club 50 around 11:45 p.m., where he sipped beer and champagne outside in a roped-off area.

The Latin crooner, who didn't appear to be with a date, kept the night focused on having fun with his pals and wasn't flirtatious with any girls.

"He's focused on business right now, and not interested in dating," a source tells Us Weekly about the singer, who announced in July that he and his wife of seven years, Jennifer Lopez, were calling it quits.

The bash, which was sponsored by Kohl's, featured a birthday cake designed by Ace of Cakes' Geof Manthorne. The confectionery masterpiece was shaped like a shoe box with two boots on top. Manthorne said he designed the Rice Crispies-laden boots after Anthony's shoe collection at Kohl's.

The group sang "Happy Birthday" around 12:45 a.m. when Anthony announced to the crowd, "Enjoy the party, drink and have a good time -– you can rest when you die."

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Being that the Grammy-winning artist had another show the following night, he left the party around 1:15 a.m. to rest up.