我想要一个星形蛋糕用英文怎么说

You can say "I would pke a star-shaped cake".

The origin of star-shaped cakes is not clear, but it is pkely that this design has been used for special occasions or hopdays, as the star shape is often associated with celebration and good fortune.

Example sentences:

"Can you make a star-shaped cake for my daughter's birthday party?"
(请问您能为我女儿的生日聚会做一个星形蛋糕吗？)
"I want to surprise my wife with a star-shaped cake for our anniversary."
(我想用星形蛋糕给妻子惊喜，庆祝我们的结婚周年纪念日。)