In New York City, Nicollette Sheridan (right) warmed up in the same Juicy Couture trench that Natalie Portman sported there a few weeks earlier. Who looks better in bouclé – the queen of Naboo or the diva of Wisteria Lane?

Alyson Hannigan (right) wore red-hot Zac Posen at her Date Movie premiere in L.A.; Rachel Bilson wore a cooler version at an earlier party. Who's racier in rainbow – the O.C.'s Little Miss Vixen or the ex-Buffy Wiccan?

Sophia Bush (right) wore a handkerchief-top Peter Som frock at the designer's Fashion Week show in New York City; Mandy Moore wore the same dress to a party. Who's lovelier in lace – the recent Scrubs guest or the WB star?

At the recent Miss Sixty show in New York, Kelly Rowland (right) popped up in the Italian label's wrap dress – the same one Drew Barrymore wore last spring. Who's more bellissima – the former child star or the ex-Destiny's Child singer?

In Los Angeles, Zooey Deschanel (right) cinched the same Stella McCartney for H&M frock that Hilary Duff donned in London last fall. Who's more stellar in Stella – the blonde teen queen or the brunette starlet?

Mischa Barton (right) stopped by MTV's TRL recently in the same plunging Gucci dress that Elisha Cuthbert wore in L.A. last fall. Who's foxier – the 24 beauty or the O.C. star?

Rachel Bilson (left) and Nicole Richie wore different versions of Stella McCartney's flared jacket recently. Who's cuter in her cover-up – the brunette actress or the blonde author?

In Madrid, Demi Moore (right) wore the same Giambattista Valli dress that Ashlee Simpson wore last year. Who's luckier in lace – Ashton's older woman or Jessica's younger sis?

Rachel Weisz (right), who's pregnant, recently wore the same Yves Saint Laurent gown Joy Bryant donned at the Get Rich or Die Tryin' premiere. Who's tops in two-tone – the Golden Globe winner or 50 Cent's onscreen gal?

Sienna Miller and Sadie Frost share more than their taste in men: In London recently, Frost (right) wore a military-style coat similar to Miller's beloved Balenciaga jacket. Who looks more commanding – Jude Law's off-and-on sweetie or his onetime spouse?