Tiny plant ID please!

Tiny plant ID please!

Observation - Tiny plant ID please! - UK and Ireland. Description: Tiny plant, forms little clumps of upright stems/fronds. En masse can almost look like grass. Can be found growing in gardens, pots, cracks in paving etc. About half an inch in height. Quite pretty, starry little thing, but I have no idea what it is

Tiny plant, forms little clumps of upright stems/fronds. En masse can almost look like grass. Can be found growing in gardens, pots, cracks in paving etc.

About half an inch in height.

Quite pretty, starry little thing, but I have no idea what it is (other than "weed").