<p><span style="line-height: 1.5em;"><div class="KonaFilter image-container float_right"><div class="image on-image"><img src="http://static4.businessinsider.com/image/527de2b269bedd896711453b-588-441/mean-girls-1.png?maxX=480" border="0" alt="Mean Girls" width="480" /><p class="source">"Mean Girls"</p><p class="caption">Amanda Seyfried and Rachel McAdams starred in "Mean Girls" in 2004.</p></div><p></p></div>It's always fun watching an older movie and spotting a supporting character who's since become a big star.</span></p>
<p>Here are some of our favorite <keyword id="6354465" type="PERSON" weightage="60" keywordseo="actors">actors</keyword> in famous movies before they became household names and some other cameos you might have forgotten about.</p>

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25 Famous Actors You Forgot Were In Famous Movies

"Mean Girls"Amanda Seyfried and Rachel McAdams starred in "Mean Girls" in 2004.It's always fun watching an older movie and spotting a supporting character who's since become a big star. Here are some of our favorite actors in famous movies before they became household names and some other cameos you might have forgotten about.

"Mean Girls"Amanda Seyfried and Rachel McAdams starred in "Mean Girls" in 2004. It's always fun watching an older movie and spotting a supporting character who's since become a big star.

25 Famous Actors You Forgot Were In Famous Movies

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