Jessica Simpson and Mariah Carey are also notorious for holding on to slightly outdated BlackBerrys, says Chui.

FORBES: Magazine Article

"People want to live the life of the rich and famous, " says Jacky Chui, who blogs at CelebrityBlackBerrySightings.com.

FORBES: Magazine Article

A-list couples like Brad Pitt and Angelina Jolie and Tom Cruise and Katie Holmes also have BlackBerrys, according to Chui.

FORBES: Celebs Make A Statement With Cellphones

Chui thinks BlackBerry's reputation as a business-minded phone played a role.

FORBES: Celebs Make A Statement With Cellphones

Chui estimates that Spears has rotated through at least five phones in recent months: the BlackBerry 8700c, LG enV, Sidekick LX, BlackBerry 8310 and, most recently, the Samsung u740.

FORBES: Magazine Article

Jeff Hawkins, Numenta co-founder, and Michael Chui, a principal at the McKinsey Global Institute will discuss on Wednesday evening an alternative approach to big data, using brain-inspired machine learning technology and a cloud-based service called Grok that recognizes complex patterns from data streams and generates actionable predictions in real time.

FORBES: Connect