This is the fifth in a series of articles from The Underwear Expert
As 2012 comes to a close, it's time to look back fondly at a year jam-packed with celebrities showing their underwear in public. The Underwear Expert keeps track of all the celebrity underwear sightings you could possibly care about so that you can keep tabs on who is wearing what, who is looking decent and who needs some serious undies advice.
With dozens of underwear sightings this year, it was tough to narrow them down, but we've come up with a list of the Top 5 celebrity underwear sightings of 2012. These were the most controversial, interesting, hilarious or popular sightings of the year. Check out our Top 5 sightings below and let us know which were your favorites...
Zac Efron: Speaking of high-schoolers in musicals, Zac Efron spent whole scenes of The Paperboy in his tightie-whities earlier this year. He manages to make the period-correct underwear work, and we're just so thankful. This paperboy really delivered.
Mark Wahlberg: For many, Wahlberg is the ultimate celebrity underwear model. He's pretty much responsible for the popularity of Calvin Klein briefs, after all. This year, he showed us that he can still look good in a pair of black briefs. He does look good, right???
Mario Lopez: Things are going well of Mr . Lopez—he's got several cool jobs, a sweet daughter and a brand-new wife. He also has not one but two underwear lines. Here, he's showing off his own Rated M briefs. What an attention ho-ho-ho.
Justin Bieber: For many, the Biebs is a fairly obnoxious popstar that we just have to tolerate. For others, like those girls in the front row, he's the greatest hope for a fallen world. Wherever you land on Bieber, he showed off his underwear enough times this year to land him a top spot on our list.
For more celebrity underwear sightings, both the best and the worst, head to The Underwear Expert.
Photos: Courtney Mazza, Fox, Lee Daniels Entertainment, Bauer Griffin & 102.7 KIIS FM