As Ashley Tisdale readies to walk down the aisle, she and fiance Christopher French are spending some low-key quality time together in Manhattan.

The couple recently indulged their sweet side at Serendipity 3, sharing a Frrrozen Hot Chocolate. Tisdale was "glowing" with happiness, a witness said of the "High School Musical" star, who sat close to her beau.

Tisdale, 29, and French, a musician, got engaged last summer.