Wearing a black suit and his trademark landing-strip goatee, Ghalib, 40, testified in a posh British accent that his relationship with the pop star changed from work-related to romantic beginning in December 2007.
Asked how often he was with Spears, he quietly replied, "Daily. I was there everyday."
Ghalib, who was subpoenaed to appear in the case, denied he ever saw Spears's former pal Sam Lutfi hide cell phones from the singer or withhold access to her dog, London.
Instead, Ghalib alleged that Spears's mom Lynne once tried to coerce him.
"She requested that I say [to the media] Sam Lutfi was responsible for Britney Spears's behavior," he said.
Under cross-examination, Ghalib confirmed that he bought a disposable cell phone at Lutfi's request to be smuggled to the singer in mid-2008, months after her father obtained legal control over her.
Ghalib also admitted that a judge ordered him to stay away from Spears for three years and was once arrested while evading a process server in the case.
Lutfi's case against the Spears family is expected to wrap Tuesday, and the singer's legal team will begin their defense. Lutfi is suing the singer for unpaid fees, Jamie Spears for allegedly punching him, and Lynne Spears for purportedly defaming him in her 2008 book.