The actress was said to have picked up style advice from the former Spice Girl while she featured in the lines Spring/Summer 2009 campaign.
The two had hit it off when the Beckhams” moved to LA and Katies designer friend had allegedly poured some influence on her, reports the Sun.
Tom Cruises better half also had full support from the ex-singer, while she made her Broadway debut with All My Sons in September last year.