John Travolta and Kelly Preston's little son Benjamin is growing up quickly!

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Baby Ben and his famous, 48-year-old momma were spotted in NYC yesterday -- where the 4-month-old looked cuter than ever.

When Benjamin was born back in November, Travolta said "He's given the house a renewed spirit and purpose" and called the baby their little "miracle."

Click the photo to get a closer look at the duo!

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