David Foster to Katharine McPhee Cash Me Outside!!!

When Katharine McPhee likes what she sees, she grabs ahold -- and what's not to like about David Foster's ass at an ATM?

The actress/singer and the legendary producer/composer were out for what looks like a date night Sunday in Brentwood. Although they've repeatedly denied dating and claimed to just be friends, all the signs are there.

- Walking arm-in-arm? Check.
- Butt grab during a cash withdrawl? Check.
- Kiss on the cheek during a cash withdrawl? Soooo check.

Just a few months ago 68-year-old Foster was all over town with Christie Brinkley.

As they say in David's biz ... the hits keep coming.

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