, D-N.J., is going gaga.

, that is.

The nation's oldest senator will hold a fundraiser at the pop singer's Monster Ball Tour at the Verizon Center in Washington on Sept. 7.

The Washington Post reports the 86-year-old New Jersey Democrat is offering seats in a private suite for $2,500 a person for political action committees and $2,400 for individuals.

An aide says the fundraiser was Lautenberg's idea. The senator and his wife celebrated his 86th birthday in January at a Gaga show at New York's Radio City Music Hall.

Lautenberg was hospitalized Feb. 15 after falling at his home and was treated for a bleeding ulcer.

He announced in June

.