Stars are pretty much perfect spheres.
The “star shape” isn’t “real” it’s due to diffraction. For telescopes - this happens due to the support structures holding up the mirrors - or the segmented mirrors in the case of telescopes that use multiple smaller mirrors rather than one big one.
With naked eye viewing, the effect is due to diffraction through your eyelashes (!!) - which is why the effect gets much bigger when you squint.
One cool “Pro-tip” to tell the difference between photos taken by Hubble and James Webb…is to count the number of “star bursts” around bright objects… these two photos are of the exact same patch of sky…
Aside from the fact that JWST is a whole lot sharper and brighter…
Hubble has four lines coming out of that bright star in the middle - which are due to refraction around the struts that hold it’s secondary mirror in front of the primary.
James Webb has six around the same star because is uses a bunch of hexagonal mirrors.