QQ plot for a fitted normal / lognormal distrbution

I'm having problems generating a QQ plot for a fitted distrubution. The data is fitted by

NormalFit <- fitdistr(obs, densfun="normal") 

where obs are the observations.

I thought I can just do

qqnorm(NormalFit)

I want to do the same for

LogNormalFit <- fitdistr(obs, densfun="log-normal")