The first of BT's "Live from the 34th floor" gigs was streamed live on YouTube in the UK last night (20 November), on both the BT Infinity channel and the YouTube masthead with rising star Conor Maynard.

Now X-Factor judge Tulisa has been announced as the second act to appear, on 10 December at 8pm .

Streamed from the top of BT Tower in London (from the 34th floor, hence the name) the gig is available free to anyone who wants to watch online. Competition winners will be in the audience at the venue.

Read: PHOTOS: BT Tower becomes Star Wars lightsaber

In addition, before each gig, fans get the chance to ask the act questions over Twitter. Tulisa will be answering hers via video posted on YouTube and her followers can post questions to her from today until 27 November, with a select few being chosen to go to the singer herself.

The next act, scheduled to perform on 15 January, is yet to be announced, but considering the two-headed sillouette on the latest promotional video, what's the betting against it being The Pet Shop Boys? Either that or a previously unheard of conjoined-twin pop combo?

Check out the live gigs at