Oh, how they grow!

Claire Danes and Hugh Dancy's son, Cyrus, made a very rare appearance with his famous parents on Sunday, Oct. 16 — and we can't get over how big he's gotten since the last time we saw him!

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Claire, Hugh and Cyrus on Oct.16.

For the family day out, Cyrus, 3, adorably sported a skeleton costume to go pick pumpkins in NYC while the happy couple donned stylish fall ensembles.

MORE: Claire Danes Makes a Surprising Confession About Her Marriage to Hugh Dancy — Find Out Here!

Claire, 37, and Hugh, 41 — who married in 2009 — previously welcomed Cyrus, their only child, in December 2012.

Click through the gallery below to see famous celebrity kids then and now!