The only time I ever look good dancing is if I’m next to my dad at a wedding.

The line is a self-deprecating joke that uses a familiar social setting—dancing at a wedding—to humanize a public figure. Deeley implies she doesn’t see herself as an especially good dancer, but that her father’s (presumably more awkward or exuberant) dancing makes her look comparatively graceful. The humor depends on affectionate family contrast and on the idea that “looking good” is relative, shaped by who you’re seen beside. It also gestures toward the way confidence and performance can be situational: even someone known for poise on television can feel ungainly in informal, personal moments.