Matt Lanter came aboard 90210 to close season one. He's become a fan favorite.
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Matt Lanter came aboard 90210 about three-quarters of the way through its first season. He plays Liam on the series.
Added:
Matt Lanter joined the cast of 90210 near the end of season one. He plays Liam, your basic bad boy.
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90210 Quotes

How is nearly having a stroke okay?

Adrianna [to Dixon]

Some things you can't forgive and forgot.

Liam [to Navid]