The 'No One' hitmaker's husband Swizz Beats threw a private party for her 33rd birthday after the Grammy Awards on Sunday (26.01.14), with 75 guests in attendance.
Insiders told the New York Post newspaper that the party-goers had to check in their phones when they arrived at the couple's Hollywood Hills home so no pictures could be leaked online.
Once inside, the revellers enjoyed Nas and Diddy performing 'Hate Me Now', before Alicia joined Nas on stage to sing Lauryn Hill's part of his hit single 'If I Ruled the World'.
'Happy Birthday' hitmaker Stevie then performed a set, with tracks including 'My Cherie Amour'.
Guests - which included rapper Busta Rhymes and music moguls Steve Stoute, Andre Harrell and Russell Simons - were also entertained by a set from DJ Cassidy.
Alicia - who has three-year-old son Egypt with her spouse - later revealed she had had a great time at the bash.
She posted on Twitter: ''I'm humbled by all the love around me! My beautiful husband @THEREALSWIZZZ, my friends & fam blew my mind this bday! (sic)''