How can I remove the numbering in the figure environment?

Question

\documentclass{beamer}
\usepackage{caption}
\begin{document}
\begin{frame}{Title}
\begin{figure}[ht]
\centering
\includegraphics[width=0.9\linewidth]{picture.jpg}
\caption{Source: something}
\end{figure}
\end{frame}
\end{document}

How can I remove the numbering from the caption in the figure environment? I tried with caption* and it didn't work.

Answer 1

Here an answer without \usepackage{caption}

\documentclass{beamer}

\setbeamertemplate{caption}{%
    \insertcaption\par
}
\setbeamertemplate{caption label separator}{}

\begin{document}

\begin{frame}{Title}
\begin{figure}
\includegraphics[width=0.9\linewidth]{pic}
\caption{Source: something}
\end{figure}
\end{frame}
\end{document}

---

Comments:

1. You don't need \centering, figures are automatically centred in beamer.
2. In a documentclass without floats, like beamer, you don't need to specify the positioning with [ht]