Earlier in the day, the duo had fallen out over a dispute about attention-seeking and playing up for airtime, but the pair put aside their differences during a game of Spin the Bottle.
Watch Lydia's teasing lap dance routine below:
The duo weren't the only pair to get intimate during the game, and Ashleigh Hughes and Luke S caught the attention of their fellow housemates with their affectionate hair-stroking and touching.
Watch Ashleigh cosying up with Luke Scrase:
Ashleigh also kissed Benedict Garrett during the game, Conor McIntyre and Arron Lowe shared a clinch, and Benedict went in for a kiss with Victoria.
The first Big Brother eviction takes place tonight (June 8) at 10pm on Channel 5.
Photo gallery - Big Brother housemates 2012: