Formal:
* Keelan é meu marido. (This is the most common and neutral way to say it.)
Informal:
* Keelan é meu esposo. (This is slightly more formal than "marido" and is often used in written contexts.)
* O Keelan é meu marido. (This is a more colloquial way to say it.)
If the speaker is female, you would use "minha" instead of "meu":
* Keelan é meu marido. (male speaker)
* Keelan é minha marido. (female speaker)
Important note: In Portuguese, the word order is usually subject-verb-object. This means that the subject ("Keelan") comes before the verb ("é") and the object ("meu marido").