I'm on the guestlist baby / Be my plus one

If the invitation doesn't say Plus One, then the guest or their representative or the guest pretending to be their own representative if they don't have one will call up to check if they can bring a Plus One. Basically, a Plus One is a guest's guest.

By then Kevin Pietersen may have been named as winner of two categories at the ICC Awards Night, which will receive more attention on Tuesday if, as expected, he is accompanied by Caprice, the model, who was due to arrive as his plus one today.

No, you ain't worth guest list / Plus one of all them girls you kiss

Plus one

Meaning

Noun

Synonyms