The singer stepped out in NYC looking bang on-trend in a white translucent shirt which showed off her black bra.
The 31-year-old American Idol alum flashed her perfect pins in black culottes which were slashed to the hip.
The star appeared on Access Hollywood Live in the outfit, before donning sunglasses to head out for lunch at Barneys New York with a female friend with remarkably similar style.
She's clearly loving her time on the East Coast, and took time to share her love for the City with Twitter followers on Friday.
She was recently seen looking cosy with estranged husband Nick Cokas - who is still involved with her music career.
Katharine filed for divorce after six years of marriage to the 50-year-old last May and the couple were in dispute about their exact date of separation.
She is rocking a well-toned figure - which she shows off to its maximum effect in racy red underwear in the saucy video to her new track.
The song was created for Katharine by Florence and the Machine's Isabella 'Isa Machine' Summers - who penned the band's mega hit Dark Days Are Over and came out at the end of last month after a five year hiatus from releasing music.
Find more stylish and summery blouses for women as follow.
Women Stylish Loose Patchwork Short Sleeve Round Neck Chiffon Shirt
New Summer Guaze Spliced Chiffon T Shirt
Women New White Lace Chiffon Three Quarters Sleeve Shirt
Women's Blouse - Lalalilo