Get in the know -- now!

From Taylor Swift to Justin Bieber** and every One Direction member in between, Hollywood can be hard to keep up with even on a slow news day.

To track the buzziest stars, Us Weekly has created Buzz Tracker**, a tool that collects data from around the web -- including Twitter mentions, Google alerts and other Internet metrics -- to help you stay up-to-date on your favorite celebs as news breaks.

CLICK HERE TO MONITOR US WEEKLY'S BUZZ TRACKER**

Here are a few of the most talked-about celebs we're following this week:

Taylor Swift: Suddenly single again! Multiple sources confirm to Us that Swift has indeed split from One Direction's Harry Styles**. Things went south after the couple's vacation to Virgin Gorda in the British Virgin Islands. "They had a fight," one insider tells Us. British crooner Styles "said something he shouldn't have . . . This [breakup] is definitely going to be for good."

JUSTIN BIEBER**: One week after a paparazzo was killed while trailing Bieber's Ferrari, the "Beauty and the Beat" singer's squeaky clean image almost went up in smoke when photos surfaced online of the 18-year-old lighting up what appeared to be marijuana. Though Bieber is owning up to his indiscretion, behind the scenes, a source tells Us, his team "isn't happy about those photos. They are grilling security about who could have taken them." (The images -- obtained by TMZ -- were reportedly snapped on Jan. 2 inside a hotel room in Newport Beach, Calif.)

KIM KARDASHIAN: Mom-to-be Kardashian and her boyfriend Kanye West** are in nesting mode. As they prepare for the arrival of their first child in 2013, the couple -- currently in Paris enjoying a babymoon -- have purchased an $11 million home in a gated community in Bel Air, Calif. The parents-to-be intend to tear down the original 10,000 square-foot structure and build their own Italian-style villa in the neighborhood Jennifer Aniston also calls home. TMZ reports their pad's luxe amenities will include a gym, movie theater, hair and makeup salon, bowling alley, basketball court and indoor and outdoor pools.

This article originally appeared on Usmagazine.com: Taylor Swift vs. Justin Bieber: Us Weekly Tracks Celebs With the Biggest Buzz!