Lily Collins is the latest Hollywood starlet to catch crop-top fever.

The stunning actress bared her toned tummy while she joined the cast of "The Mortal Instruments" series Tuesday. She and co-stars Kevin Zegers and (off-screen boyfriend) Jamie Campbell Bower hit the press junket scene for a Q&A autograph session at Chicago Ridge Mall.

lily collins

Collins flashed only a peek of skin, tastefully covering up in a matching jacket and short suit ensemble. Her magenta lipstick and shorter summer haircut completed the chic look.

lily collins

The "Mortal Instruments: City of Bones" installment hits theaters August 21, with its second film arriving next year. The movies recall themes of blockbusters past -- its use of demons, a female heroine and loyal young adult following from best-selling books reminds us of certain hits (hint: "Twilight" and "The Hunger Games").

lily collins

Collins recently gushed to Seventeen that she admires fellow actresses Jennifer Lawrence and Kristen Stewart for their career moves and grace. Hopefully she follows in JLaw's fashion footsteps instead of Kristen's.

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