Shenae Grimes' Annie is in for a shock on tonight's episode of "90210" when AnnaLynne McCord's Naomi springs their half-brother on her and AccessHollywood.com has your exclusive first look at a scene from that episode.
Guest star Charlie Weber plays the pair's half-brother, Mark.
In the clip, it's clearly a surprise for Mark too, who thinks he's at Naomi's house to talk about providing the food (he runs a gourmet food truck) for a party.
"90210" airs Monday at 9/8c on The CW.
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