"Ms. Bruni is a catch?" What does catch here mean?

[Aleaf]

Ms.Bruni is a catch? what does catch here mean?

and what does "She is rocker arm candy" mean? arm candy?

Thanks a lot
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Try to change youself before you try to change others.

[Yankee]

Hi Aleaf

In the context of discussion about Carla Bruni, 'a catch' is a person considered desirable as a partner or spouse. (See definition 5 here.)

'Arm candy' is an extremely beautiful person who accompanies a member of the opposite sex to a party or event, but is not romantically involved with that person (cf. eye candy).

And you can find the definition of 'rocker' here.
.

[Aleaf]

thanks a lot and the website's great:))
_________________
Try to change youself before you try to change others.