Happy birthday, honey! Jenna's parents start her day of right in this scene.
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Jenna turns 16 during this episode. It's a sufficiently awkward occasion for her.
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Awkward Season 1 Episode 9 Quotes

Lacey: Isn't it perfect?
Jenna: Yep. Perfect for entertaining clients as a highly paid escort.

As far as I was concerned 15 could suck it because 16, well, it was starting off pretty damn good.

Jenna