*An insider tells the new issue of Us Weekly that Halle Berry, 45, has been jealous of the time her powerhouse stylist Deb Waknin spends with another A-list client: Sandra Bullock, 47.

Waknin was “spending all her time with Sandra and not giving Halle any attention,” the insider explains. “Halle got jealous because when she needed Deb, she was always with Sandra.”

Newly engaged Berry — mom to Nahla, 4, with ex Gabriel Aubry – reportedly dropped Waknin and hired Heidi Klum’s stylist Maryam Malakpour on two occasions. (A rep for Berry denies any rift, insisting, “Deb and Halle have worked together on and off for years.”)

As for Berry’s relationship with Bullock, mom to son Louis, 2? “There’s no jealousy between them,” the insider tells Us. “They are friends.”