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(PHOTO SOURCE: SI)

We are officially four days away until the Baltimore Ravens and the San Francisco 49ers do battle in Super Bowl XLVII.

Over the next couple of days, we are going to be beating you over the head with an endless amount of Super Bowl content. 

VIDEO: BOOTYLICIOUS! Watch Beyonce Pop That During Super Bowl Rehearsals 

Since today is Thursday, we decided to have a special Throwback Thursday dedicated to stars of this year’s Super Bowl.

This Super Bowl is called The HarBowl because this is the first time two brothers will be coaching against each other in a championship game. Little brother Jim Harbaugh coaches the San Francisco 49ers, while John Harbaugh leads the Baltimore Ravens.

PHOTOS: Beyonce Breaks A Sweat During Super Bowl Rehearsals

The picture you see up top is of John and Jim Harbaugh as kids (Jim is the one with the green shirt and the screw face, while John has the football sweater.)

Scroll down to see some more throwback pics of some of your favorite NFL stars who’ll be playing this Sunday. 

San Francisco 49ers QB Colin Kaepernick cheeses it up as a child. 

Baltimore Ravens Safety Ed Reed had the mean ice grill while playing football for Destrehan High School.

The self-proclaimed “greatest wide receiver of all time” posing for his high school prom pic.

Baltimore Ravens wide receiver Torrey Smith was looking thugged out as a college student at Maryland. 

San Francisco 49er tight end Vernon Davis and his brother were looking super dapper as kids. 

Ravens middle linebacker Ray Lewis (the dude in the middle) was a terror during his University of Miami days. 

Ravens lineman Michael Oher was the inspiration behind The Blind Side book and movie. 

Unless Kaepernick gets hurt, 49ers QB Alex Smith won’t see any playing time on Sunday. (PHOTO SOURCE: ESPN

Sorry A$AP Rocky, but if Joe Flacco wins the Super Bowl, we will officially be calling the Ravens QB Lord Flacco. (PHOTO SOURCE: USATODAY)