Danilo Aleksandar Petrović-Njegoš (Serbian Cyrillic: Данило Александар Петровић-Његош; 29 June 1871– 24 September 1939) was the Crown Prince of Montenegro.

On 1 March 1921 Danilo was proclaimed the rightful King of Montenegro (upon the death of his father) and became head of the government-in-exile until 7 March 1921 when, for reasons that are still unclear, Danilo renounced his royal claims and headship of the royal house in favour of his nephew, Prince Michael of Montenegro.

After his renunciation in 1921, Prince Danilo resurfaced in 1927 when he sued Metro-Goldwyn-Mayer for libel and collected $4,000 in a Paris court for the false depiction of him in the first Hollywood version of the film The Merry Widow.

[1][2] In the film, "Prince Danilo of Montenegro" seduces a commoner and then rejects her because it could impoverish the royal treasury.

The pair met in Russia, where Danilo was visiting his sisters Milica and Anastasia, while Jutta was staying with her cousin, Duchess Helene of Mecklenburg-Strelitz.