Kourtney Kardashian

We spotted several stylish celebs working chic ensembles this week, but there were a handful of trendsetters who were extra inspiring. Kourtney Kardashian showcased a sophisticated take on colorblocking in Miami, Anne Hathaway dazzled in a sequined Nina Ricci dress at a star-studded event in NYC, and Kristen Stewart styled a holiday-chic duo in Marin County. But that's not all; Miranda Kerr inspired us to work our white denim for a sweet vacation-ready style, while Olivia Palermo's all-black ensemble held the key to monochromatic success. Cruise through to get a closer look at this week's top styles, then draw inspiration from their spotlight-worthy fashions for work, play, or a holiday soiree.

Kourtney Kardashian held her 5-month-old daughter, Penelope, during a trip to the beach in Miami yesterday. They were joined by Kourtney's boyfriend, Scott Disick, and their oldest child, Mason. Kourtney and Scott welcomed Penelope over the Summer and her birth, like Mason's, was featured on their TV show Keeping Up With the Kardashians. Kourtney is currently in the middle of filming the third season of Kourtney and Kim Take Miami, which premieres in January, with her sister Kim Kardashian. The duo went furniture shopping together before Kourtney changed into casual clothes for her afternoon in the sand. They were apart for the Thanksgiving holiday, though, with Kim traveling back to LA and Kourtney staying in Miami with her family of four.

This week's best-dressed celebrities taught us a handful of key Fall fashion lessons we'll be implementing pronto. Kourtney Kardashian proved that having a pair of colored leather shorts is essential, Kristen Stewart inspired us to take more risks and to test-drive the black and white color combo, and Miranda Kerr showed off the sexy way to play with proportions. Other style tips came courtesy of Mandy Moore, Ali Larter, Eva Mendes, and Taylor Swift. Step inside to check out this week's top stars, then shop their looks to spice up your Fall wardrobe.

It was a batty Halloween for Kim Kardashian and her pals in Miami last night. The group, including Kanye West, Kourtney Kardashian, Scott Disick, and Jonathan Cheban, went as characters from Batman, with Kim and Kanye taking the lead as Catwoman and Batman. They arrived at LIV Nightclub, where they not only celebrated the spooky holiday, but also belatedly marked Kim's 32nd birthday. While Kim, Kanye, Kourtney, and Scott were busy with their costumed festivities in Florida, Khloé got to work in LA. She made her debut as the new host of The X Factor with Mario Lopez, and after wrapping up the live show, quickly headed to the Staples Center to watch her husband, Lamar Odom, play in the Clippers game. Khloé was on Kim's mind, though, since she tweeted, "Omg!!! I'm literally crying! Khloe looks beautiful on the X Factor!!! Not sure why I'm crying, just so proud of my little sister!"

Kim Kardashian wore a sheer, beaded top with a black bra as she stepped out with Kanye West, Kourtney Kardashian, and Scott Disick yesterday in Miami. The foursome was spotted toting shopping bags from Neiman Marcus while strolling the city's luxe Bal Harbour Shops. They also made a stop for lunch at Makoto, a restaurant inside the mall.

Kim and Kanye are back in Florida, where she and Kourtney are taping their E! reality show, after making a trip to Rome earlier this month to celebrate Kim's 32nd birthday. The pair went shopping and dined out to mark the milestone. Kim and Kanye don't only wait for special occasions to take romantic getaways, however. Since they began dating, they've traveled to Paris, Cannes, and Mexico, just to name a few destinations.