But it wasn't just the anticipation of hearing her first studio record in seven years that had guests, including Topshop's Sir Philip Green, so excited.
After years away from the public eye, Whitney was also back on super-glamorous form, looking fantastic in a black and white leopard print dress.
It was a far cry from her troubling appearance in previous years as she struggled with substance abuse issues.
The Bodyguard star – the goddaughter of the queen of soul Aretha Franklin – thrilled her London audience as she unveiled her long-awaited seventh studio album, I Look To You.
Due for release in the UK at the end of August, the record has been hailed as a "labour of love" by music mogul Clive Davis, who discovered the star and has been working with her on her comeback. "You won't forget it after you hear it," he promised.
And while she has so far received mixed reviews for her latest music project, Whitney's vocal talent speaks for itself.
She is still the only artist ever to have had seven consecutive multi-platinum albums – a record that puts her ahead of the Beatles – and to date she has sold 140 million albums worldwide and 50 million singles.