Heidi Montag nostalgic over 'Hills'

Heidi Montag has admitted that she misses her former co-stars from The Hills.

The 23-year-old revealed on Twitter that she has been watching classic episodes of the series, which finished last month.

She said: "[I'm] watching old Hills [episodes]. I miss you @AudrinaPatridge and most of all @laurenconrad."

It was recently announced that MTV has commissioned a new show examining Montag's experience with plastic surgery.

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