Macca’s grandson & Reese’s daughter

PAUL McCartney’s grandson Arthur steps out with Reese Witherspoon’s daughter Ava after helping their famed relatives at film premieres.

The 18-year-olds managed to slip away from the oldies to eat at trendy Sketch in Mayfair, Central London.

Yale student Arthur, looking remarkably like a teenage Macca, had accompanied his grandad and photographer mum Mary, 48, to a screening of 60s documentary My Generation.

He enrolled at the US university last year after leaving £19,545-ayear University College School in Hampstead, North London.

Model Ava – Reese’s daughter with ex-husband Ryan Phillippe – was supporting her 41-year-old mum as she premiered A Wrinkle In Time.

The two are often compared. Actor Ryan, 43, once remarked: “I find that such a weird thing.

“People say Ava looks exactly like her mother. Who else is she going to look like? It’s odd that people fixate on that.”

YOUNG ONES Arthur and Ava go on the town

WITH GRANDAD Arthur, Mary and Sir Paul, 71, on the red carpet

WITH MUM Ava and Reese at film premiere

ESCAPE Pair give oldies the slip for trendy meal

FROM ME TO YOU Young Paul was a lot like Arthur