Earlier this week, Lily Allen -- now officially known as Lily Rose Cooper -- made a guest appearance at a private taping of VH1's 'Storytellers' alongside pop icon Pink. Apparently, it was quite the party, with Butch Walker and the fun. frontman there as well.

On Aug. 21, Pink exclaimed via Twitter: "I filmed VH1 storytellers last night- dream come true performance. Thanks Lily Rose Cooper, Nate Ruess and Butch Walker for joining me!!!!" Cooper also tweeted about the evening, sharing a photo of her performing 'True Love' with Pink. The studio recording of 'True Love' features Cooper as a guest vocalist as well and will appear on Pink's forthcoming album, 'The Truth About Love,' which hits stores on Sept. 18.

As Cooper remarked to the Sun: “It was great, felt strange being back on stage again but Pink made me feel at ease. Really enjoyed myself though. Can’t wait to get back out there.” The 'Storytellers' episode, filmed at Sony Studios in Los Angeles, Calif., is scheduled to air on Nov. 13.

The British singer is rumored to be pregnant and expecting another baby some time in December. She has also been working with producer Greg Kurstin on a new record.