She’s six months pregnant, but that didn’t stop Lily Allen from joining her pal Professor Green onstage in London last night (October 19). The “Smile” songstress, who announced a five-year break from music earlier this year, was all too happy to go back on her word and do a little song-and-dance action for a duet on “Just Be Good To Green.” Lily donned some snazzy maternity attire for the gig, including a metallic empire-line dress and leopard print cardigan. But the most impressive part of Ms. Allen’s getup were her towering platform heels, though she didn’t seem impeded by h...