Fans of both the Postal Service and Jenny Lewis got some fantastic news last month, when it was revealed that the Rilo Kelly singer would serve as a backup singer during the electronic duo's much-anticipated 2013 comeback tour. Now, there's even more good news: Lewis sings on two previously unreleased songs that will be included on the forthcoming ‘Give Up Deluxe 10th Anniversary Edition’ reissue of their only album.

Lewis herself revealed the news via a round of Twitter posts to an account she recently created for Rilo Kiley to help promote the band's forthcoming archival compilation, 'rkives.'

"Super psyched for the PS reunion tour... i love ben and jimmy," she wrote in one post, followed by the answer of "yes, both" when asked by a fan, "are you featured in any of the new bonus tracks the postal service came out with?"

The expanded 'Give Up' is due out April 9, while Rilo Kelly's 'rkives' drops a week before on April 2. And while the Postal Service are also slated to kick of the aforementioned tour on April 9 in Reno, Nev., with Lewis in tow, Rilo Kiley have no such plans to hit the road. When asked in that same Twitter chat, "will there be a tour supporting this album?" Lewis answered simply: "no shows."

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