Check out EJ Johnson's weight loss, y'all!

Oh, sorry -- back to your regularly-scheduled story ... Nicky Hilton launched her fashion tome 365 Style with a party at aunt Kyle Richards' Beverly Hills boutique Tuesday night. Family and friends got in on the celebration -- with mom Kathy showing off designs from her dress line, sis Paris providing the glam, and aunts Kim and Kyle lending support and inviting their Real Housewives of Beverly Hills co-stars Camille Grammer and Lisa VanderPump to join. Nicky herself, stunned in thigh-heigh boots and a flirty silk dress.

Perhaps the most popular guest of the evening was EJ Johnson of Rich Kids of Beverly Hills as he strutted his much-lighter weight stuff with his co-stars Morgan Stewart and Dorothy Chang. The reality star and fashion blogger wore his usual black-and-white look with his Chanel padlock necklace, patent leather oxfords and carried a purple crocodile clutch. Loves!

Dorothy Wang wore a pleated leather cheerleader-length skirt with leopard-spotted platform Mary Janes. Morgan kept it cool, as always, with a silk tee, destroyed denim and nude patent leather pumps. Camille wore a light-hearted Magritte dress from Opening Ceremony while Lisa was decked out in what appeared to be crushed velvet -- and interesting choice for her.

So back to the book ... Amazon describes it as: "From red carpets and runways to front row at Fashion Week, designer and muse Nicky Hilton has earned her reputation as a style icon. Exposed to the top tier of the fashion industry from childhood, in this style guide Hilton reveals tips and tricks of the trade she has learned along the way."

Can't wait to read it!